diff --git a/Signal/src/Jobs/MessageFetcherJob.swift b/Signal/src/Jobs/MessageFetcherJob.swift
index 52ae389d3..37c68eba0 100644
--- a/Signal/src/Jobs/MessageFetcherJob.swift
+++ b/Signal/src/Jobs/MessageFetcherJob.swift
@@ -127,10 +127,6 @@ public class MessageFetcherJob: NSObject {
         }
         builder.setType(type)
 
-        if let relay = messageDict["relay"] as? String {
-            builder.setRelay(relay)
-        }
-
         guard let timestamp = messageDict["timestamp"] as? UInt64 else {
             Logger.error("\(self.logTag) message body didn't have timestamp")
             return nil
diff --git a/Signal/src/ViewControllers/ConversationView/ConversationViewController.m b/Signal/src/ViewControllers/ConversationView/ConversationViewController.m
index 8a1f71ab0..c3e8f4eda 100644
--- a/Signal/src/ViewControllers/ConversationView/ConversationViewController.m
+++ b/Signal/src/ViewControllers/ConversationView/ConversationViewController.m
@@ -74,7 +74,6 @@
 #import <SignalServiceKit/OWSPrimaryStorage.h>
 #import <SignalServiceKit/OWSReadReceiptManager.h>
 #import <SignalServiceKit/OWSVerificationStateChangeMessage.h>
-#import <SignalServiceKit/SignalRecipient.h>
 #import <SignalServiceKit/TSAccountManager.h>
 #import <SignalServiceKit/TSGroupModel.h>
 #import <SignalServiceKit/TSInvalidIdentityKeyReceivingErrorMessage.h>
diff --git a/Signal/src/ViewControllers/DebugUI/DebugUIMessages.m b/Signal/src/ViewControllers/DebugUI/DebugUIMessages.m
index 9a1ded442..2241d9d2d 100644
--- a/Signal/src/ViewControllers/DebugUI/DebugUIMessages.m
+++ b/Signal/src/ViewControllers/DebugUI/DebugUIMessages.m
@@ -3729,7 +3729,6 @@ typedef OWSContact * (^OWSContactBlock)(YapDatabaseReadWriteTransaction *transac
                                                            digest:nil
                                                         byteCount:filesize
                                                       contentType:@"audio/mp3"
-                                                            relay:@""
                                                    sourceFilename:@"test.mp3"
                                                    attachmentType:TSAttachmentTypeDefault];
                 pointer.state = TSAttachmentPointerStateFailed;
@@ -4596,7 +4595,6 @@ typedef OWSContact * (^OWSContactBlock)(YapDatabaseReadWriteTransaction *transac
                                                    digest:nil
                                                 byteCount:filesize
                                               contentType:fakeAssetLoader.mimeType
-                                                    relay:@""
                                            sourceFilename:fakeAssetLoader.filename
                                            attachmentType:TSAttachmentTypeDefault];
         attachmentPointer.state = TSAttachmentPointerStateFailed;
diff --git a/SignalMessaging/environment/Release.m b/SignalMessaging/environment/Release.m
index 210408b6b..0824d0428 100644
--- a/SignalMessaging/environment/Release.m
+++ b/SignalMessaging/environment/Release.m
@@ -24,8 +24,7 @@
         ContactsUpdater *contactsUpdater = [ContactsUpdater sharedUpdater];
         OWSMessageSender *messageSender = [[OWSMessageSender alloc] initWithNetworkManager:networkManager
                                                                             primaryStorage:primaryStorage
-                                                                           contactsManager:contactsManager
-                                                                           contactsUpdater:contactsUpdater];
+                                                                           contactsManager:contactsManager];
 
         instance = [[Environment alloc] initWithContactsManager:contactsManager
                                                 contactsUpdater:contactsUpdater
diff --git a/SignalServiceKit/src/Contacts/ContactsUpdater.h b/SignalServiceKit/src/Contacts/ContactsUpdater.h
index 8ede7a494..a686db178 100644
--- a/SignalServiceKit/src/Contacts/ContactsUpdater.h
+++ b/SignalServiceKit/src/Contacts/ContactsUpdater.h
@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "SignalRecipient.h"
@@ -12,8 +12,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (instancetype)sharedUpdater;
 
-- (nullable SignalRecipient *)synchronousLookup:(NSString *)identifier error:(NSError **)error;
-
 // This asynchronously tries to verify whether or not a contact id
 // corresponds to a service account.
 //
diff --git a/SignalServiceKit/src/Contacts/ContactsUpdater.m b/SignalServiceKit/src/Contacts/ContactsUpdater.m
index 8d972f7c0..6c0e9cc63 100644
--- a/SignalServiceKit/src/Contacts/ContactsUpdater.m
+++ b/SignalServiceKit/src/Contacts/ContactsUpdater.m
@@ -38,38 +38,6 @@ NS_ASSUME_NONNULL_BEGIN
     return self;
 }
 
-- (nullable SignalRecipient *)synchronousLookup:(NSString *)identifier error:(NSError **)error
-{
-    OWSAssert(error);
-
-    DDLogInfo(@"%@ %s %@", self.logTag, __PRETTY_FUNCTION__, identifier);
-
-    dispatch_semaphore_t sema = dispatch_semaphore_create(0);
-
-    __block SignalRecipient *recipient;
-
-    // Assigning to a pointer parameter within the block is not preventing the referenced error from being dealloc
-    // Instead, we avoid ambiguity in ownership by assigning to a local __block variable ensuring the error will be
-    // retained until our error parameter can take ownership.
-    __block NSError *retainedError;
-    [self lookupIdentifier:identifier
-        success:^(SignalRecipient *fetchedRecipient) {
-            recipient = fetchedRecipient;
-            dispatch_semaphore_signal(sema);
-        }
-        failure:^(NSError *lookupError) {
-            DDLogError(
-                @"%@ Could not find recipient for recipientId: %@, error: %@.", self.logTag, identifier, lookupError);
-
-            retainedError = lookupError;
-            dispatch_semaphore_signal(sema);
-        }];
-
-    dispatch_semaphore_wait(sema, DISPATCH_TIME_FOREVER);
-    *error = retainedError;
-    return recipient;
-}
-
 - (void)lookupIdentifier:(NSString *)identifier
                  success:(void (^)(SignalRecipient *recipient))success
                  failure:(void (^)(NSError *error))failure
@@ -173,7 +141,7 @@ NS_ASSUME_NONNULL_BEGIN
       TSRequest *request = [OWSRequestFactory contactsIntersectionRequestWithHashesArray:hashes];
       [[TSNetworkManager sharedManager] makeRequest:request
           success:^(NSURLSessionDataTask *tsTask, id responseDict) {
-              NSMutableDictionary *attributesForIdentifier = [NSMutableDictionary dictionary];
+              NSMutableSet *identifiers = [NSMutableSet new];
               NSArray *contactsArray = [(NSDictionary *)responseDict objectForKey:@"contacts"];
 
               // Map attributes to phone numbers
@@ -182,34 +150,26 @@ NS_ASSUME_NONNULL_BEGIN
                       NSString *hash = [dict objectForKey:@"token"];
                       NSString *identifier = [phoneNumbersByHashes objectForKey:hash];
 
-                      if (!identifier) {
+                      if (identifier.length < 1) {
                           DDLogWarn(@"%@ An interesecting hash wasn't found in the mapping.", self.logTag);
-                          break;
+                          continue;
                       }
 
-                      [attributesForIdentifier setObject:dict forKey:identifier];
+                      [identifiers addObject:identifier];
                   }
               }
 
               // Insert or update contact attributes
+              //
+              // TODO: Do we need to _eagerly_ ensure a SignalRecipient instance exists?
               [OWSPrimaryStorage.dbReadWriteConnection
                   readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
-                      for (NSString *identifier in attributesForIdentifier) {
-                          SignalRecipient *recipient = [SignalRecipient recipientWithTextSecureIdentifier:identifier
-                                                                                          withTransaction:transaction];
-                          if (!recipient) {
-                              recipient = [[SignalRecipient alloc] initWithTextSecureIdentifier:identifier relay:nil];
-                          }
-
-                          NSDictionary *attributes = [attributesForIdentifier objectForKey:identifier];
-
-                          recipient.relay = attributes[@"relay"];
-
-                          [recipient saveWithTransaction:transaction];
+                      for (NSString *identifier in identifiers) {
+                          [SignalRecipient ensureRecipientExistsWithRecipientId:identifier transaction:transaction];
                       }
                   }];
 
-              success([NSSet setWithArray:attributesForIdentifier.allKeys]);
+              success([identifiers copy]);
           }
           failure:^(NSURLSessionDataTask *task, NSError *error) {
               if (!IsNSErrorNetworkFailure(error)) {
diff --git a/SignalServiceKit/src/Contacts/SignalAccount.h b/SignalServiceKit/src/Contacts/SignalAccount.h
index 7f61c7b30..e2345c515 100644
--- a/SignalServiceKit/src/Contacts/SignalAccount.h
+++ b/SignalServiceKit/src/Contacts/SignalAccount.h
@@ -15,7 +15,6 @@ NS_ASSUME_NONNULL_BEGIN
 // * Contacts with multiple signal accounts will correspond to
 //   multiple instances of SignalAccount.
 // * For non-contacts, the contact property will be nil.
-//
 @interface SignalAccount : TSYapDatabaseObject
 
 // An E164 value identifying the signal account.
diff --git a/SignalServiceKit/src/Contacts/SignalRecipient.h b/SignalServiceKit/src/Contacts/SignalRecipient.h
index d9e6aa9a2..8e9896b7e 100644
--- a/SignalServiceKit/src/Contacts/SignalRecipient.h
+++ b/SignalServiceKit/src/Contacts/SignalRecipient.h
@@ -6,32 +6,36 @@
 
 NS_ASSUME_NONNULL_BEGIN
 
+// This class serves two purposes:
+//
+// * We only _persist_ SignalRecipient instances when we know
+//   that it corresponds to an account on the Signal service.
+//   So SignalRecipient serves as a defacto cache of "known
+//   Signal users."
+// * We hang the "known device list" for signal accounts on
+//   this entity.
 @interface SignalRecipient : TSYapDatabaseObject
 
-- (instancetype)initWithTextSecureIdentifier:(NSString *)textSecureIdentifier
-                                       relay:(nullable NSString *)relay;
+@property (readonly) NSOrderedSet *devices;
+
+- (instancetype)init NS_UNAVAILABLE;
 
 + (instancetype)selfRecipient;
 
++ (SignalRecipient *)ensureRecipientExistsWithRecipientId:(NSString *)recipientId
+                                              transaction:(YapDatabaseReadWriteTransaction *)transaction;
+
 + (void)ensureRecipientExistsWithRecipientId:(NSString *)recipientId
                                     deviceId:(UInt32)deviceId
-                                       relay:(NSString *)relay
                                  transaction:(YapDatabaseReadWriteTransaction *)transaction;
 
 + (nullable instancetype)recipientWithTextSecureIdentifier:(NSString *)textSecureIdentifier;
 + (nullable instancetype)recipientWithTextSecureIdentifier:(NSString *)textSecureIdentifier
                                            withTransaction:(YapDatabaseReadTransaction *)transaction;
 
-@property (readonly) NSOrderedSet *devices;
 - (void)addDevices:(NSSet *)set;
 - (void)removeDevices:(NSSet *)set;
 
-@property (nonatomic, nullable) NSString *relay;
-
-- (BOOL)supportsVoice;
-// This property indicates support for both WebRTC audio and video calls.
-- (BOOL)supportsWebRTC;
-
 - (NSString *)recipientId;
 
 - (NSComparisonResult)compare:(SignalRecipient *)other;
diff --git a/SignalServiceKit/src/Contacts/SignalRecipient.m b/SignalServiceKit/src/Contacts/SignalRecipient.m
index 55d8003f2..351e74f9e 100644
--- a/SignalServiceKit/src/Contacts/SignalRecipient.m
+++ b/SignalServiceKit/src/Contacts/SignalRecipient.m
@@ -3,7 +3,6 @@
 //
 
 #import "SignalRecipient.h"
-#import "OWSIdentityManager.h"
 #import "TSAccountManager.h"
 #import <YapDatabase/YapDatabaseConnection.h>
 
@@ -15,24 +14,44 @@ NS_ASSUME_NONNULL_BEGIN
 
 @end
 
+#pragma mark -
+
 @implementation SignalRecipient
 
 + (NSString *)collection {
     return @"SignalRecipient";
 }
 
++ (SignalRecipient *)ensureRecipientExistsWithRecipientId:(NSString *)recipientId
+                                              transaction:(YapDatabaseReadWriteTransaction *)transaction
+{
+    SignalRecipient *_Nullable recipient =
+        [self recipientWithTextSecureIdentifier:recipientId withTransaction:transaction];
+    if (recipient) {
+        return recipient;
+    }
+
+    DDLogDebug(@"%@ creating recipient: %@", self.logTag, recipientId);
+
+    recipient = [[self alloc] initWithTextSecureIdentifier:recipientId];
+    [recipient saveWithTransaction:transaction];
+    return recipient;
+}
+
 + (void)ensureRecipientExistsWithRecipientId:(NSString *)recipientId
                                     deviceId:(UInt32)deviceId
-                                       relay:(NSString *)relay
                                  transaction:(YapDatabaseReadWriteTransaction *)transaction
 {
     SignalRecipient *_Nullable existingRecipient =
         [self recipientWithTextSecureIdentifier:recipientId withTransaction:transaction];
     if (!existingRecipient) {
-        DDLogDebug(
-            @"%@ in %s creating recipient with deviceId: %u", self.logTag, __PRETTY_FUNCTION__, (unsigned int)deviceId);
+        DDLogDebug(@"%@ in %s creating recipient: %@, with deviceId: %u",
+            self.logTag,
+            __PRETTY_FUNCTION__,
+            recipientId,
+            (unsigned int)deviceId);
 
-        SignalRecipient *newRecipient = [[self alloc] initWithTextSecureIdentifier:recipientId relay:relay];
+        SignalRecipient *newRecipient = [[self alloc] initWithTextSecureIdentifier:recipientId];
         [newRecipient addDevices:[NSSet setWithObject:@(deviceId)]];
         [newRecipient saveWithTransaction:transaction];
 
@@ -51,7 +70,6 @@ NS_ASSUME_NONNULL_BEGIN
 }
 
 - (instancetype)initWithTextSecureIdentifier:(NSString *)textSecureIdentifier
-                                       relay:(nullable NSString *)relay
 {
     self = [super initWithUniqueId:textSecureIdentifier];
     if (!self) {
@@ -75,8 +93,6 @@ NS_ASSUME_NONNULL_BEGIN
         _devices = [NSOrderedSet orderedSetWithObject:@(1)];
     }
 
-    _relay = [relay isEqualToString:@""] ? nil : relay;
-
     return self;
 }
 
@@ -118,7 +134,7 @@ NS_ASSUME_NONNULL_BEGIN
 {
     SignalRecipient *myself = [self recipientWithTextSecureIdentifier:[TSAccountManager localNumber]];
     if (!myself) {
-        myself = [[self alloc] initWithTextSecureIdentifier:[TSAccountManager localNumber] relay:nil];
+        myself = [[self alloc] initWithTextSecureIdentifier:[TSAccountManager localNumber]];
     }
     return myself;
 }
@@ -144,16 +160,6 @@ NS_ASSUME_NONNULL_BEGIN
     self.devices = [updatedDevices copy];
 }
 
-- (BOOL)supportsVoice
-{
-    return YES;
-}
-
-- (BOOL)supportsWebRTC
-{
-    return YES;
-}
-
 - (NSString *)recipientId
 {
     return self.uniqueId;
diff --git a/SignalServiceKit/src/Contacts/Threads/TSContactThread.h b/SignalServiceKit/src/Contacts/Threads/TSContactThread.h
index 0c28b19b2..c0ac5c256 100644
--- a/SignalServiceKit/src/Contacts/Threads/TSContactThread.h
+++ b/SignalServiceKit/src/Contacts/Threads/TSContactThread.h
@@ -15,10 +15,6 @@ NS_ASSUME_NONNULL_BEGIN
 + (instancetype)getOrCreateThreadWithContactId:(NSString *)contactId
                                    transaction:(YapDatabaseReadWriteTransaction *)transaction;
 
-+ (instancetype)getOrCreateThreadWithContactId:(NSString *)contactId
-                                   transaction:(YapDatabaseReadWriteTransaction *)transaction
-                                         relay:(nullable NSString *)relay;
-
 // Unlike getOrCreateThreadWithContactId, this will _NOT_ create a thread if one does not already exist.
 + (nullable instancetype)getThreadWithContactId:(NSString *)contactId transaction:(YapDatabaseReadTransaction *)transaction;
 
diff --git a/SignalServiceKit/src/Contacts/Threads/TSContactThread.m b/SignalServiceKit/src/Contacts/Threads/TSContactThread.m
index 1fbf3dc36..d6bd281a6 100644
--- a/SignalServiceKit/src/Contacts/Threads/TSContactThread.m
+++ b/SignalServiceKit/src/Contacts/Threads/TSContactThread.m
@@ -27,35 +27,6 @@ NS_ASSUME_NONNULL_BEGIN
     return self;
 }
 
-+ (instancetype)getOrCreateThreadWithContactId:(NSString *)contactId
-                                   transaction:(YapDatabaseReadWriteTransaction *)transaction
-                                         relay:(nullable NSString *)relay
-{
-    OWSAssert(contactId.length > 0);
-
-    SignalRecipient *recipient =
-        [SignalRecipient recipientWithTextSecureIdentifier:contactId withTransaction:transaction];
-
-    if (!recipient) {
-        // If no recipient record exists for that contactId, create an empty record
-        // for immediate use, then ask ContactsUpdater to try to update it async.
-        recipient =
-            [[SignalRecipient alloc] initWithTextSecureIdentifier:contactId
-                                                            relay:relay];
-        [recipient saveWithTransaction:transaction];
-
-        // Update recipient with Server record async.
-        [[ContactsUpdater sharedUpdater] lookupIdentifier:contactId
-            success:^(SignalRecipient *recipient) {
-            }
-            failure:^(NSError *error) {
-                DDLogWarn(@"Failed to lookup contact with error:%@", error);
-            }];
-    }
-
-    return [self getOrCreateThreadWithContactId:contactId transaction:transaction];
-}
-
 + (instancetype)getOrCreateThreadWithContactId:(NSString *)contactId
                                    transaction:(YapDatabaseReadWriteTransaction *)transaction {
     OWSAssert(contactId.length > 0);
@@ -68,6 +39,9 @@ NS_ASSUME_NONNULL_BEGIN
         [thread saveWithTransaction:transaction];
     }
 
+    // TODO: Do we need to _eagerly_ ensure a SignalRecipient instance exists?
+    [SignalRecipient ensureRecipientExistsWithRecipientId:contactId transaction:transaction];
+
     return thread;
 }
 
diff --git a/SignalServiceKit/src/Contacts/Threads/TSGroupThread.m b/SignalServiceKit/src/Contacts/Threads/TSGroupThread.m
index be7f09200..13341b9cd 100644
--- a/SignalServiceKit/src/Contacts/Threads/TSGroupThread.m
+++ b/SignalServiceKit/src/Contacts/Threads/TSGroupThread.m
@@ -4,7 +4,6 @@
 
 #import "TSGroupThread.h"
 #import "NSData+Base64.h"
-#import "SignalRecipient.h"
 #import "TSAttachmentStream.h"
 #import <SignalServiceKit/TSAccountManager.h>
 #import <YapDatabase/YapDatabaseConnection.h>
diff --git a/SignalServiceKit/src/Devices/OWSRecordTranscriptJob.m b/SignalServiceKit/src/Devices/OWSRecordTranscriptJob.m
index 64f20b1b4..4dc206bac 100644
--- a/SignalServiceKit/src/Devices/OWSRecordTranscriptJob.m
+++ b/SignalServiceKit/src/Devices/OWSRecordTranscriptJob.m
@@ -80,7 +80,6 @@ NS_ASSUME_NONNULL_BEGIN
 
     OWSAttachmentsProcessor *attachmentsProcessor =
         [[OWSAttachmentsProcessor alloc] initWithAttachmentProtos:transcript.attachmentPointerProtos
-                                                            relay:transcript.relay
                                                    networkManager:self.networkManager
                                                       transaction:transaction];
 
diff --git a/SignalServiceKit/src/Messages/Attachments/OWSAttachmentsProcessor.h b/SignalServiceKit/src/Messages/Attachments/OWSAttachmentsProcessor.h
index b1a8b19c5..361aa9676 100644
--- a/SignalServiceKit/src/Messages/Attachments/OWSAttachmentsProcessor.h
+++ b/SignalServiceKit/src/Messages/Attachments/OWSAttachmentsProcessor.h
@@ -30,7 +30,6 @@ extern NSString *const kAttachmentDownloadAttachmentIDKey;
 - (instancetype)init NS_UNAVAILABLE;
 
 - (instancetype)initWithAttachmentProtos:(NSArray<OWSSignalServiceProtosAttachmentPointer *> *)attachmentProtos
-                                   relay:(nullable NSString *)relay
                           networkManager:(TSNetworkManager *)networkManager
                              transaction:(YapDatabaseReadWriteTransaction *)transaction NS_DESIGNATED_INITIALIZER;
 
diff --git a/SignalServiceKit/src/Messages/Attachments/OWSAttachmentsProcessor.m b/SignalServiceKit/src/Messages/Attachments/OWSAttachmentsProcessor.m
index 0e1132786..980fc5635 100644
--- a/SignalServiceKit/src/Messages/Attachments/OWSAttachmentsProcessor.m
+++ b/SignalServiceKit/src/Messages/Attachments/OWSAttachmentsProcessor.m
@@ -57,7 +57,6 @@ static const CGFloat kAttachmentDownloadProgressTheta = 0.001f;
 }
 
 - (instancetype)initWithAttachmentProtos:(NSArray<OWSSignalServiceProtosAttachmentPointer *> *)attachmentProtos
-                                   relay:(nullable NSString *)relay
                           networkManager:(TSNetworkManager *)networkManager
                              transaction:(YapDatabaseReadWriteTransaction *)transaction
 {
@@ -72,7 +71,7 @@ static const CGFloat kAttachmentDownloadProgressTheta = 0.001f;
     NSMutableArray<TSAttachmentPointer *> *attachmentPointers = [NSMutableArray new];
 
     for (OWSSignalServiceProtosAttachmentPointer *attachmentProto in attachmentProtos) {
-        TSAttachmentPointer *pointer = [TSAttachmentPointer attachmentPointerFromProto:attachmentProto relay:relay];
+        TSAttachmentPointer *pointer = [TSAttachmentPointer attachmentPointerFromProto:attachmentProto];
 
         [attachmentIds addObject:pointer.uniqueId];
         [pointer saveWithTransaction:transaction];
@@ -152,8 +151,7 @@ static const CGFloat kAttachmentDownloadProgressTheta = 0.001f;
     if (attachment.serverId < 100) {
         DDLogError(@"%@ Suspicious attachment id: %llu", self.logTag, (unsigned long long)attachment.serverId);
     }
-    TSRequest *request =
-        [OWSRequestFactory attachmentRequestWithAttachmentId:attachment.serverId relay:attachment.relay];
+    TSRequest *request = [OWSRequestFactory attachmentRequestWithAttachmentId:attachment.serverId];
 
     [self.networkManager makeRequest:request
         success:^(NSURLSessionDataTask *task, id responseObject) {
diff --git a/SignalServiceKit/src/Messages/Attachments/TSAttachmentPointer.h b/SignalServiceKit/src/Messages/Attachments/TSAttachmentPointer.h
index ddd96cad7..9920d6813 100644
--- a/SignalServiceKit/src/Messages/Attachments/TSAttachmentPointer.h
+++ b/SignalServiceKit/src/Messages/Attachments/TSAttachmentPointer.h
@@ -25,14 +25,11 @@ typedef NS_ENUM(NSUInteger, TSAttachmentPointerState) {
                           digest:(nullable NSData *)digest
                        byteCount:(UInt32)byteCount
                      contentType:(NSString *)contentType
-                           relay:(NSString *)relay
                   sourceFilename:(nullable NSString *)sourceFilename
                   attachmentType:(TSAttachmentType)attachmentType NS_DESIGNATED_INITIALIZER;
 
-+ (TSAttachmentPointer *)attachmentPointerFromProto:(OWSSignalServiceProtosAttachmentPointer *)attachmentProto
-                                              relay:(NSString *_Nullable)relay;
++ (TSAttachmentPointer *)attachmentPointerFromProto:(OWSSignalServiceProtosAttachmentPointer *)attachmentProto;
 
-@property (nonatomic, readonly) NSString *relay;
 @property (atomic) TSAttachmentPointerState state;
 @property (nullable, atomic) NSString *mostRecentFailureLocalizedText;
 
diff --git a/SignalServiceKit/src/Messages/Attachments/TSAttachmentPointer.m b/SignalServiceKit/src/Messages/Attachments/TSAttachmentPointer.m
index b1fbcead2..00a61c68d 100644
--- a/SignalServiceKit/src/Messages/Attachments/TSAttachmentPointer.m
+++ b/SignalServiceKit/src/Messages/Attachments/TSAttachmentPointer.m
@@ -30,7 +30,6 @@ NS_ASSUME_NONNULL_BEGIN
                           digest:(nullable NSData *)digest
                        byteCount:(UInt32)byteCount
                      contentType:(NSString *)contentType
-                           relay:(NSString *)relay
                   sourceFilename:(nullable NSString *)sourceFilename
                   attachmentType:(TSAttachmentType)attachmentType
 {
@@ -45,7 +44,6 @@ NS_ASSUME_NONNULL_BEGIN
 
     _digest = digest;
     _state = TSAttachmentPointerStateEnqueued;
-    _relay = relay;
     self.attachmentType = attachmentType;
 
     return self;
@@ -53,7 +51,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 
 + (TSAttachmentPointer *)attachmentPointerFromProto:(OWSSignalServiceProtosAttachmentPointer *)attachmentProto
-                                              relay:(NSString *_Nullable)relay
 {
     OWSAssert(attachmentProto.id != 0);
     OWSAssert(attachmentProto.key != nil);
@@ -75,7 +72,6 @@ NS_ASSUME_NONNULL_BEGIN
                                                                           digest:digest
                                                                        byteCount:attachmentProto.size
                                                                      contentType:attachmentProto.contentType
-                                                                           relay:relay
                                                                   sourceFilename:attachmentProto.fileName
                                                                   attachmentType:attachmentType];
     return pointer;
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSIncomingSentMessageTranscript.h b/SignalServiceKit/src/Messages/DeviceSyncing/OWSIncomingSentMessageTranscript.h
index 93e3b4317..a6b9d3737 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSIncomingSentMessageTranscript.h
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSIncomingSentMessageTranscript.h
@@ -19,10 +19,8 @@ NS_ASSUME_NONNULL_BEGIN
 @interface OWSIncomingSentMessageTranscript : NSObject
 
 - (instancetype)initWithProto:(OWSSignalServiceProtosSyncMessageSent *)sentProto
-                        relay:(nullable NSString *)relay
                   transaction:(YapDatabaseReadWriteTransaction *)transaction;
 
-@property (nonatomic, readonly) NSString *relay;
 @property (nonatomic, readonly) OWSSignalServiceProtosDataMessage *dataMessage;
 @property (nonatomic, readonly) NSString *recipientId;
 @property (nonatomic, readonly) uint64_t timestamp;
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSIncomingSentMessageTranscript.m b/SignalServiceKit/src/Messages/DeviceSyncing/OWSIncomingSentMessageTranscript.m
index 01490fc49..333fd0dad 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSIncomingSentMessageTranscript.m
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSIncomingSentMessageTranscript.m
@@ -19,7 +19,6 @@ NS_ASSUME_NONNULL_BEGIN
 @implementation OWSIncomingSentMessageTranscript
 
 - (instancetype)initWithProto:(OWSSignalServiceProtosSyncMessageSent *)sentProto
-                        relay:(nullable NSString *)relay
                   transaction:(YapDatabaseReadWriteTransaction *)transaction
 {
     self = [super init];
@@ -27,7 +26,6 @@ NS_ASSUME_NONNULL_BEGIN
         return self;
     }
 
-    _relay = relay;
     _dataMessage = sentProto.message;
     _recipientId = sentProto.destination;
     _timestamp = sentProto.timestamp;
@@ -45,9 +43,8 @@ NS_ASSUME_NONNULL_BEGIN
         _thread = [TSContactThread getOrCreateThreadWithContactId:_recipientId transaction:transaction];
     }
 
-    _quotedMessage =
-        [TSQuotedMessage quotedMessageForDataMessage:_dataMessage thread:_thread relay:relay transaction:transaction];
-    _contact = [OWSContacts contactForDataMessage:_dataMessage relay:relay transaction:transaction];
+    _quotedMessage = [TSQuotedMessage quotedMessageForDataMessage:_dataMessage thread:_thread transaction:transaction];
+    _contact = [OWSContacts contactForDataMessage:_dataMessage transaction:transaction];
 
     return self;
 }
diff --git a/SignalServiceKit/src/Messages/Interactions/OWSContact.h b/SignalServiceKit/src/Messages/Interactions/OWSContact.h
index 7dfc2ed86..254436f39 100644
--- a/SignalServiceKit/src/Messages/Interactions/OWSContact.h
+++ b/SignalServiceKit/src/Messages/Interactions/OWSContact.h
@@ -10,7 +10,6 @@ NS_ASSUME_NONNULL_BEGIN
 @class CNContact;
 @class OWSAttachmentInfo;
 @class OWSSignalServiceProtosDataMessage;
-@class OWSSignalServiceProtosDataMessage;
 @class OWSSignalServiceProtosDataMessageContact;
 @class TSAttachment;
 @class TSAttachmentStream;
@@ -177,7 +176,6 @@ NSString *NSStringForContactAddressType(OWSContactAddressType value);
 + (nullable OWSSignalServiceProtosDataMessageContact *)protoForContact:(OWSContact *)contact;
 
 + (nullable OWSContact *)contactForDataMessage:(OWSSignalServiceProtosDataMessage *)dataMessage
-                                         relay:(nullable NSString *)relay
                                    transaction:(YapDatabaseReadWriteTransaction *)transaction;
 
 @end
diff --git a/SignalServiceKit/src/Messages/Interactions/OWSContact.m b/SignalServiceKit/src/Messages/Interactions/OWSContact.m
index a05c514b8..b105602f1 100644
--- a/SignalServiceKit/src/Messages/Interactions/OWSContact.m
+++ b/SignalServiceKit/src/Messages/Interactions/OWSContact.m
@@ -893,7 +893,6 @@ NSString *NSStringForContactAddressType(OWSContactAddressType value)
 }
 
 + (nullable OWSContact *)contactForDataMessage:(OWSSignalServiceProtosDataMessage *)dataMessage
-                                         relay:(nullable NSString *)relay
                                    transaction:(YapDatabaseReadWriteTransaction *)transaction
 {
     OWSAssert(dataMessage);
@@ -968,8 +967,7 @@ NSString *NSStringForContactAddressType(OWSContactAddressType value)
         if (avatarInfo.hasAvatar) {
             OWSSignalServiceProtosAttachmentPointer *avatarAttachment = avatarInfo.avatar;
 
-            TSAttachmentPointer *attachmentPointer =
-                [TSAttachmentPointer attachmentPointerFromProto:avatarAttachment relay:relay];
+            TSAttachmentPointer *attachmentPointer = [TSAttachmentPointer attachmentPointerFromProto:avatarAttachment];
             [attachmentPointer saveWithTransaction:transaction];
 
             contact.avatarAttachmentId = attachmentPointer.uniqueId;
diff --git a/SignalServiceKit/src/Messages/Interactions/TSQuotedMessage.h b/SignalServiceKit/src/Messages/Interactions/TSQuotedMessage.h
index 202f8f1ec..49d973fec 100644
--- a/SignalServiceKit/src/Messages/Interactions/TSQuotedMessage.h
+++ b/SignalServiceKit/src/Messages/Interactions/TSQuotedMessage.h
@@ -92,7 +92,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (nullable instancetype)quotedMessageForDataMessage:(OWSSignalServiceProtosDataMessage *)dataMessage
                                               thread:(TSThread *)thread
-                                               relay:(nullable NSString *)relay
                                          transaction:(YapDatabaseReadWriteTransaction *)transaction;
 
 @end
diff --git a/SignalServiceKit/src/Messages/Interactions/TSQuotedMessage.m b/SignalServiceKit/src/Messages/Interactions/TSQuotedMessage.m
index a846b5e6a..4dc7881e0 100644
--- a/SignalServiceKit/src/Messages/Interactions/TSQuotedMessage.m
+++ b/SignalServiceKit/src/Messages/Interactions/TSQuotedMessage.m
@@ -105,7 +105,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (TSQuotedMessage *_Nullable)quotedMessageForDataMessage:(OWSSignalServiceProtosDataMessage *)dataMessage
                                                    thread:(TSThread *)thread
-                                                    relay:(nullable NSString *)relay
                                               transaction:(YapDatabaseReadWriteTransaction *)transaction
 {
     OWSAssert(dataMessage);
@@ -169,7 +168,7 @@ NS_ASSUME_NONNULL_BEGIN
 
             OWSSignalServiceProtosAttachmentPointer *thumbnailAttachmentProto = quotedAttachment.thumbnail;
             TSAttachmentPointer *thumbnailPointer =
-                [TSAttachmentPointer attachmentPointerFromProto:thumbnailAttachmentProto relay:relay];
+                [TSAttachmentPointer attachmentPointerFromProto:thumbnailAttachmentProto];
             [thumbnailPointer saveWithTransaction:transaction];
 
             attachmentInfo.thumbnailAttachmentPointerId = thumbnailPointer.uniqueId;
diff --git a/SignalServiceKit/src/Messages/InvalidKeyMessages/TSInvalidIdentityKeySendingErrorMessage.m b/SignalServiceKit/src/Messages/InvalidKeyMessages/TSInvalidIdentityKeySendingErrorMessage.m
index c1cdd2983..4dd0a1764 100644
--- a/SignalServiceKit/src/Messages/InvalidKeyMessages/TSInvalidIdentityKeySendingErrorMessage.m
+++ b/SignalServiceKit/src/Messages/InvalidKeyMessages/TSInvalidIdentityKeySendingErrorMessage.m
@@ -8,7 +8,6 @@
 #import "OWSPrimaryStorage+SessionStore.h"
 #import "OWSPrimaryStorage.h"
 #import "PreKeyBundle+jsonDict.h"
-#import "SignalRecipient.h"
 #import "TSContactThread.h"
 #import "TSErrorMessage_privateConstructor.h"
 #import "TSOutgoingMessage.h"
diff --git a/SignalServiceKit/src/Messages/OWSMessageDecrypter.m b/SignalServiceKit/src/Messages/OWSMessageDecrypter.m
index 001b3aa4c..fca8303ea 100644
--- a/SignalServiceKit/src/Messages/OWSMessageDecrypter.m
+++ b/SignalServiceKit/src/Messages/OWSMessageDecrypter.m
@@ -112,7 +112,6 @@ NS_ASSUME_NONNULL_BEGIN
         = ^(NSData *_Nullable plaintextData, YapDatabaseReadWriteTransaction *transaction) {
               [SignalRecipient ensureRecipientExistsWithRecipientId:envelope.source
                                                            deviceId:envelope.sourceDevice
-                                                              relay:envelope.relay
                                                         transaction:transaction];
 
               successBlockParameter(plaintextData, transaction);
diff --git a/SignalServiceKit/src/Messages/OWSMessageManager.m b/SignalServiceKit/src/Messages/OWSMessageManager.m
index 74f49f420..47989a9cd 100644
--- a/SignalServiceKit/src/Messages/OWSMessageManager.m
+++ b/SignalServiceKit/src/Messages/OWSMessageManager.m
@@ -516,7 +516,6 @@ NS_ASSUME_NONNULL_BEGIN
     OWSAssert(groupThread);
     OWSAttachmentsProcessor *attachmentsProcessor =
         [[OWSAttachmentsProcessor alloc] initWithAttachmentProtos:@[ dataMessage.group.avatar ]
-                                                            relay:envelope.relay
                                                    networkManager:self.networkManager
                                                       transaction:transaction];
 
@@ -553,7 +552,6 @@ NS_ASSUME_NONNULL_BEGIN
 
     OWSAttachmentsProcessor *attachmentsProcessor =
         [[OWSAttachmentsProcessor alloc] initWithAttachmentProtos:dataMessage.attachments
-                                                            relay:envelope.relay
                                                    networkManager:self.networkManager
                                                       transaction:transaction];
     if (!attachmentsProcessor.hasSupportedAttachments) {
@@ -605,7 +603,6 @@ NS_ASSUME_NONNULL_BEGIN
     if (syncMessage.hasSent) {
         OWSIncomingSentMessageTranscript *transcript =
             [[OWSIncomingSentMessageTranscript alloc] initWithProto:syncMessage.sent
-                                                              relay:envelope.relay
                                                         transaction:transaction];
 
         OWSRecordTranscriptJob *recordJob =
@@ -916,8 +913,7 @@ NS_ASSUME_NONNULL_BEGIN
     uint64_t timestamp = envelope.timestamp;
     NSString *body = dataMessage.body;
     NSData *groupId = dataMessage.hasGroup ? dataMessage.group.id : nil;
-    OWSContact *_Nullable contact =
-        [OWSContacts contactForDataMessage:dataMessage relay:envelope.relay transaction:transaction];
+    OWSContact *_Nullable contact = [OWSContacts contactForDataMessage:dataMessage transaction:transaction];
 
     if (dataMessage.group.type == OWSSignalServiceProtosGroupContextTypeRequestInfo) {
         [self handleGroupInfoRequest:envelope dataMessage:dataMessage transaction:transaction];
@@ -1016,7 +1012,6 @@ NS_ASSUME_NONNULL_BEGIN
 
                 TSQuotedMessage *_Nullable quotedMessage = [TSQuotedMessage quotedMessageForDataMessage:dataMessage
                                                                                                  thread:oldGroupThread
-                                                                                                  relay:envelope.relay
                                                                                             transaction:transaction];
 
                 DDLogDebug(@"%@ incoming message from: %@ for group: %@ with timestamp: %lu",
@@ -1060,13 +1055,11 @@ NS_ASSUME_NONNULL_BEGIN
             self.logTag,
             envelopeAddress(envelope),
             (unsigned long)timestamp);
-        TSContactThread *thread = [TSContactThread getOrCreateThreadWithContactId:envelope.source
-                                                                      transaction:transaction
-                                                                            relay:envelope.relay];
+        TSContactThread *thread =
+            [TSContactThread getOrCreateThreadWithContactId:envelope.source transaction:transaction];
 
         TSQuotedMessage *_Nullable quotedMessage = [TSQuotedMessage quotedMessageForDataMessage:dataMessage
                                                                                          thread:thread
-                                                                                          relay:envelope.relay
                                                                                     transaction:transaction];
 
         TSIncomingMessage *incomingMessage =
diff --git a/SignalServiceKit/src/Messages/OWSMessageSender.h b/SignalServiceKit/src/Messages/OWSMessageSender.h
index 6b65f8f9b..95c488969 100644
--- a/SignalServiceKit/src/Messages/OWSMessageSender.h
+++ b/SignalServiceKit/src/Messages/OWSMessageSender.h
@@ -8,11 +8,9 @@ NS_ASSUME_NONNULL_BEGIN
 
 extern const NSUInteger kOversizeTextMessageSizeThreshold;
 
-@class ContactsUpdater;
 @class OWSBlockingManager;
 @class OWSPrimaryStorage;
 @class OWSUploadingService;
-@class SignalRecipient;
 @class TSInvalidIdentityKeySendingErrorMessage;
 @class TSNetworkManager;
 @class TSOutgoingMessage;
@@ -42,15 +40,13 @@ NS_SWIFT_NAME(MessageSender)
 
     // For subclassing in tests
     OWSUploadingService *_uploadingService;
-    ContactsUpdater *_contactsUpdater;
 }
 
 - (instancetype)init NS_UNAVAILABLE;
 
 - (instancetype)initWithNetworkManager:(TSNetworkManager *)networkManager
                         primaryStorage:(OWSPrimaryStorage *)primaryStorage
-                       contactsManager:(id<ContactsManagerProtocol>)contactsManager
-                       contactsUpdater:(ContactsUpdater *)contactsUpdater;
+                       contactsManager:(id<ContactsManagerProtocol>)contactsManager;
 
 - (void)setBlockingManager:(OWSBlockingManager *)blockingManager;
 
diff --git a/SignalServiceKit/src/Messages/OWSMessageSender.m b/SignalServiceKit/src/Messages/OWSMessageSender.m
index 4b8c46580..ea2f506e4 100644
--- a/SignalServiceKit/src/Messages/OWSMessageSender.m
+++ b/SignalServiceKit/src/Messages/OWSMessageSender.m
@@ -4,7 +4,6 @@
 
 #import "OWSMessageSender.h"
 #import "AppContext.h"
-#import "ContactsUpdater.h"
 #import "NSData+keyVersionByte.h"
 #import "NSData+messagePadding.h"
 #import "NSDate+OWS.h"
@@ -216,7 +215,6 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
 @property (nonatomic, readonly) OWSBlockingManager *blockingManager;
 @property (nonatomic, readonly) YapDatabaseConnection *dbConnection;
 @property (nonatomic, readonly) id<ContactsManagerProtocol> contactsManager;
-@property (nonatomic, readonly) ContactsUpdater *contactsUpdater;
 @property (atomic, readonly) NSMutableDictionary<NSString *, NSOperationQueue *> *sendingQueueMap;
 
 @end
@@ -226,7 +224,6 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
 - (instancetype)initWithNetworkManager:(TSNetworkManager *)networkManager
                         primaryStorage:(OWSPrimaryStorage *)primaryStorage
                        contactsManager:(id<ContactsManagerProtocol>)contactsManager
-                       contactsUpdater:(ContactsUpdater *)contactsUpdater
 {
     self = [super init];
     if (!self) {
@@ -236,7 +233,6 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
     _networkManager = networkManager;
     _primaryStorage = primaryStorage;
     _contactsManager = contactsManager;
-    _contactsUpdater = contactsUpdater;
     _sendingQueueMap = [NSMutableDictionary new];
     _dbConnection = primaryStorage.newDatabaseConnection;
 
@@ -451,42 +447,19 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
 
 - (NSArray<SignalRecipient *> *)signalRecipientsForRecipientIds:(NSArray<NSString *> *)recipientIds
                                                         message:(TSOutgoingMessage *)message
-                                                          error:(NSError **)error
 {
     OWSAssert(recipientIds);
     OWSAssert(message);
-    OWSAssert(error);
-
-    *error = nil;
 
     NSMutableArray<SignalRecipient *> *recipients = [NSMutableArray new];
-
-    for (NSString *recipientId in recipientIds) {
-        SignalRecipient *existingRecipient = [SignalRecipient recipientWithTextSecureIdentifier:recipientId];
-
-        if (existingRecipient) {
-            [recipients addObject:existingRecipient];
-        } else {
-            SignalRecipient *newRecipient = [self.contactsUpdater synchronousLookup:recipientId error:error];
-            if (newRecipient) {
-                [recipients addObject:newRecipient];
-            } else {
-                DDLogWarn(@"%@ No SignalRecipient for recipientId: %@", self.logTag, recipientId);
-                [self.dbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
-                    // Mark this recipient as "skipped".
-                    [message updateWithSkippedRecipient:recipientId transaction:transaction];
-                }];
-            }
+    [self.dbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
+        for (NSString *recipientId in recipientIds) {
+            SignalRecipient *recipient =
+                [SignalRecipient ensureRecipientExistsWithRecipientId:recipientId transaction:transaction];
+            [recipients addObject:recipient];
         }
-    }
-
-    if (recipients.count == 0 && !*error) {
-        // error should be set in contactsUpater, but just in case.
-        OWSProdError([OWSAnalyticsEvents messageSenderErrorCouldNotFindContacts1]);
-        *error = OWSErrorMakeFailedToSendOutgoingMessageError();
-    }
-
-    return [recipients copy];
+    }];
+    return recipients;
 }
 
 - (void)sendMessageToService:(TSOutgoingMessage *)message
@@ -553,20 +526,9 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
                 return;
             }
 
-            NSError *error;
             NSArray<SignalRecipient *> *recipients =
-                [self signalRecipientsForRecipientIds:sendingRecipientIds.allObjects message:message error:&error];
-
-            if (recipients.count == 0) {
-                if (!error) {
-                    OWSProdError([OWSAnalyticsEvents messageSenderErrorCouldNotFindContacts2]);
-                    error = OWSErrorMakeFailedToSendOutgoingMessageError();
-                }
-                // If no recipients were found, there's no reason to retry. It will just fail again.
-                [error setIsRetryable:NO];
-                failureHandler(error);
-                return;
-            }
+                [self signalRecipientsForRecipientIds:sendingRecipientIds.allObjects message:message];
+            OWSAssert(recipients.count == sendingRecipientIds.count);
 
             [self groupSend:recipients message:message thread:gThread success:successHandler failure:failureHandler];
 
@@ -593,26 +555,11 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
                 return;
             }
 
-            SignalRecipient *recipient = [SignalRecipient recipientWithTextSecureIdentifier:recipientContactId];
-            if (!recipient) {
-                NSError *error;
-                // possibly returns nil.
-                recipient = [self.contactsUpdater synchronousLookup:recipientContactId error:&error];
-
-                if (error) {
-                    if (error.code == OWSErrorCodeNoSuchSignalRecipient) {
-                        DDLogWarn(@"%@ recipient contact not found", self.logTag);
-                        [self unregisteredRecipient:recipient message:message thread:thread];
-                    }
-
-                    OWSProdError([OWSAnalyticsEvents messageSenderErrorCouldNotFindContacts3]);
-                    // No need to repeat trying to find a failure. Apart from repeatedly failing, it would also cause us
-                    // to print redundant error messages.
-                    [error setIsRetryable:NO];
-                    failureHandler(error);
-                    return;
-                }
-            }
+            __block SignalRecipient *recipient;
+            [self.dbConnection readWriteWithBlock:^(YapDatabaseReadWriteTransaction *transaction) {
+                recipient =
+                    [SignalRecipient ensureRecipientExistsWithRecipientId:recipientContactId transaction:transaction];
+            }];
 
             if (!recipient) {
                 NSError *error = OWSErrorMakeFailedToSendOutgoingMessageError();
@@ -977,7 +924,6 @@ NSString *const OWSMessageSenderRateLimitedException = @"RateLimitedException";
 
     TSRequest *request = [OWSRequestFactory submitMessageRequestWithRecipient:recipient.uniqueId
                                                                      messages:deviceMessages
-                                                                        relay:recipient.relay
                                                                     timeStamp:message.timestamp];
     if (useWebsocketIfAvailable && TSSocketManager.canMakeRequests) {
         [TSSocketManager.sharedManager makeRequest:request
diff --git a/SignalServiceKit/src/Network/API/Requests/OWSRequestFactory.h b/SignalServiceKit/src/Network/API/Requests/OWSRequestFactory.h
index d73be79c1..9ea9864c1 100644
--- a/SignalServiceKit/src/Network/API/Requests/OWSRequestFactory.h
+++ b/SignalServiceKit/src/Network/API/Requests/OWSRequestFactory.h
@@ -37,7 +37,7 @@ typedef NS_ENUM(NSUInteger, TSVerificationTransport) { TSVerificationTransportVo
 
 + (TSRequest *)allocAttachmentRequest;
 
-+ (TSRequest *)attachmentRequestWithAttachmentId:(UInt64)attachmentId relay:(nullable NSString *)relay;
++ (TSRequest *)attachmentRequestWithAttachmentId:(UInt64)attachmentId;
 
 + (TSRequest *)availablePreKeysCountRequest;
 
@@ -60,7 +60,6 @@ typedef NS_ENUM(NSUInteger, TSVerificationTransport) { TSVerificationTransportVo
 
 + (TSRequest *)submitMessageRequestWithRecipient:(NSString *)recipientId
                                         messages:(NSArray *)messages
-                                           relay:(nullable NSString *)relay
                                        timeStamp:(uint64_t)timeStamp;
 
 + (TSRequest *)registerSignedPrekeyRequestWithSignedPreKeyRecord:(SignedPreKeyRecord *)signedPreKey;
diff --git a/SignalServiceKit/src/Network/API/Requests/OWSRequestFactory.m b/SignalServiceKit/src/Network/API/Requests/OWSRequestFactory.m
index 1b38b7ea5..334252fc0 100644
--- a/SignalServiceKit/src/Network/API/Requests/OWSRequestFactory.m
+++ b/SignalServiceKit/src/Network/API/Requests/OWSRequestFactory.m
@@ -101,17 +101,12 @@ NS_ASSUME_NONNULL_BEGIN
     return [TSRequest requestWithUrl:[NSURL URLWithString:path] method:@"GET" parameters:@{}];
 }
 
-+ (TSRequest *)attachmentRequestWithAttachmentId:(UInt64)attachmentId relay:(nullable NSString *)relay
++ (TSRequest *)attachmentRequestWithAttachmentId:(UInt64)attachmentId
 {
     OWSAssert(attachmentId > 0);
 
     NSString *path = [NSString stringWithFormat:@"%@/%llu", textSecureAttachmentsAPI, attachmentId];
 
-    // TODO: Should this be in the parameters?
-    if (relay.length > 0) {
-        path = [path stringByAppendingFormat:@"?relay=%@", relay];
-    }
-
     return [TSRequest requestWithUrl:[NSURL URLWithString:path] method:@"GET" parameters:@{}];
 }
 
@@ -211,7 +206,6 @@ NS_ASSUME_NONNULL_BEGIN
 
 + (TSRequest *)submitMessageRequestWithRecipient:(NSString *)recipientId
                                         messages:(NSArray *)messages
-                                           relay:(nullable NSString *)relay
                                        timeStamp:(uint64_t)timeStamp
 {
     // NOTE: messages may be empty; See comments in OWSDeviceManager.
@@ -219,14 +213,11 @@ NS_ASSUME_NONNULL_BEGIN
     OWSAssert(timeStamp > 0);
 
     NSString *path = [textSecureMessagesAPI stringByAppendingString:recipientId];
-    NSMutableDictionary *parameters = [@{
+    NSDictionary *parameters = @{
         @"messages" : messages,
         @"timestamp" : @(timeStamp),
-    } mutableCopy];
+    };
 
-    if (relay) {
-        parameters[@"relay"] = relay;
-    }
     return [TSRequest requestWithUrl:[NSURL URLWithString:path] method:@"PUT" parameters:parameters];
 }
 
diff --git a/SignalServiceKit/src/Network/API/TSNetworkManager.m b/SignalServiceKit/src/Network/API/TSNetworkManager.m
index d0414d70f..9ac53d739 100644
--- a/SignalServiceKit/src/Network/API/TSNetworkManager.m
+++ b/SignalServiceKit/src/Network/API/TSNetworkManager.m
@@ -222,6 +222,7 @@ typedef void (^failureBlock)(NSURLSessionDataTask *task, NSError *error);
               break;
           }
           case 417: {
+              // TODO: Is this response code obsolete?
               DDLogWarn(@"The number is already registered on a relay. Please unregister there first: %@", request);
               failureBlock(task,
                            [self errorWithHTTPCode:statusCode
diff --git a/SignalServiceKit/src/Protocols/ProtoBuf+OWS.m b/SignalServiceKit/src/Protocols/ProtoBuf+OWS.m
index 00e207d9c..ae6c0bdb8 100644
--- a/SignalServiceKit/src/Protocols/ProtoBuf+OWS.m
+++ b/SignalServiceKit/src/Protocols/ProtoBuf+OWS.m
@@ -1,13 +1,12 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
+#import "Cryptography.h"
 #import "ProfileManagerProtocol.h"
 #import "ProtoBuf+OWS.h"
-#import "SignalRecipient.h"
 #import "TSThread.h"
 #import "TextSecureKitEnv.h"
-#import "Cryptography.h"
 
 NS_ASSUME_NONNULL_BEGIN