diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/controllers/MessageController.java b/service/src/main/java/org/whispersystems/textsecuregcm/controllers/MessageController.java
index 2b0e1b3fb..958ff6733 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/controllers/MessageController.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/controllers/MessageController.java
@@ -298,17 +298,8 @@ public class MessageController {
       validateCompleteDeviceList(destination.get(), messages.getMessages(), isSyncMessage);
       validateRegistrationIds(destination.get(), messages.getMessages());
 
-      // iOS versions prior to 5.5.0.7 send `online` on  IncomingMessageList.message, rather on the top-level entity.
-      // This causes some odd client behaviors, such as persisted typing indicators, so we have a temporary
-      // server-side adaptation.
-      final boolean online = messages.getMessages()
-          .stream()
-          .findFirst()
-          .map(IncomingMessage::isOnline)
-          .orElse(messages.isOnline());
-
       final List<Tag> tags = List.of(UserAgentTagUtil.getPlatformTag(userAgent),
-                                     Tag.of(EPHEMERAL_TAG_NAME, String.valueOf(online)),
+                                     Tag.of(EPHEMERAL_TAG_NAME, String.valueOf(messages.isOnline())),
                                      Tag.of(SENDER_TYPE_TAG_NAME, senderType));
 
       for (IncomingMessage incomingMessage : messages.getMessages()) {
@@ -316,7 +307,7 @@ public class MessageController {
 
         if (destinationDevice.isPresent()) {
           Metrics.counter(SENT_MESSAGE_COUNTER_NAME, tags).increment();
-          sendMessage(source, destination.get(), destinationDevice.get(), messages.getTimestamp(), online, incomingMessage);
+          sendMessage(source, destination.get(), destinationDevice.get(), messages.getTimestamp(), messages.isOnline(), incomingMessage);
         }
       }
 
diff --git a/service/src/main/java/org/whispersystems/textsecuregcm/entities/IncomingMessage.java b/service/src/main/java/org/whispersystems/textsecuregcm/entities/IncomingMessage.java
index d8aca7297..cb84c5be2 100644
--- a/service/src/main/java/org/whispersystems/textsecuregcm/entities/IncomingMessage.java
+++ b/service/src/main/java/org/whispersystems/textsecuregcm/entities/IncomingMessage.java
@@ -32,9 +32,6 @@ public class IncomingMessage {
   @JsonProperty
   private long   timestamp; // deprecated
 
-  @JsonProperty
-  private Boolean online; // use IncomingMessageList.online - this is a temporary adaptation for older clients
-
   public String getDestination() {
     return destination;
   }
@@ -62,8 +59,4 @@ public class IncomingMessage {
   public String getContent() {
     return content;
   }
-
-  public Boolean isOnline() {
-    return online;
-  }
 }
diff --git a/service/src/test/java/org/whispersystems/textsecuregcm/tests/controllers/MessageControllerTest.java b/service/src/test/java/org/whispersystems/textsecuregcm/tests/controllers/MessageControllerTest.java
index be5495ea3..9c4945dc7 100644
--- a/service/src/test/java/org/whispersystems/textsecuregcm/tests/controllers/MessageControllerTest.java
+++ b/service/src/test/java/org/whispersystems/textsecuregcm/tests/controllers/MessageControllerTest.java
@@ -583,37 +583,6 @@ class MessageControllerTest {
 
   }
 
-
-  @ParameterizedTest
-  @MethodSource
-  void testOnlineMessage(final String fixture, final boolean expectedOnline) throws Exception {
-
-    final Response response =
-        resources.getJerseyTest()
-            .target(String.format("/v1/messages/%s", SINGLE_DEVICE_RECIPIENT))
-            .request()
-            .header("Authorization", AuthHelper.getAuthHeader(AuthHelper.VALID_NUMBER, AuthHelper.VALID_PASSWORD))
-            .put(Entity.entity(mapper.readValue(jsonFixture(fixture), IncomingMessageList.class),
-                MediaType.APPLICATION_JSON_TYPE));
-
-    assertThat("Good Response", response.getStatus(), is(equalTo(200)));
-
-    verify(messageSender, times(1)).sendMessage(any(Account.class), any(Device.class), any(Envelope.class), eq(expectedOnline));
-  }
-
-  private static Stream<Arguments> testOnlineMessage() {
-    return Stream.of(
-        Arguments.of("fixtures/current_message_single_device.json", false), // default to `false` when absent
-        Arguments.of("fixtures/online_message_true.json", true),
-        Arguments.of("fixtures/online_message_false.json", false),
-        // iOS versions prior to 5.5.0.7 send `online` on  IncomingMessageList.message, rather on the top-level entity.
-        // This causes some odd client behaviors, such as persisted typing indicators, so we have a temporary
-        // server-side adaptation.
-        Arguments.of("fixtures/online_message_true_nested_property.json", true),
-        Arguments.of("fixtures/online_message_false_nested_property.json", false)
-    );
-  }
-
   @Test
   void testReportMessage() {
 
diff --git a/service/src/test/resources/fixtures/online_message_false.json b/service/src/test/resources/fixtures/online_message_false.json
deleted file mode 100644
index 265e10feb..000000000
--- a/service/src/test/resources/fixtures/online_message_false.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "online": false,
-  "messages": [
-    {
-      "type": 1,
-      "destinationDeviceId": 1,
-      "body": "Zm9vYmFyego",
-      "timestamp": 1234
-    }
-  ]
-}
diff --git a/service/src/test/resources/fixtures/online_message_false_nested_property.json b/service/src/test/resources/fixtures/online_message_false_nested_property.json
deleted file mode 100644
index 77111f71d..000000000
--- a/service/src/test/resources/fixtures/online_message_false_nested_property.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "messages": [
-    {
-      "type": 1,
-      "destinationDeviceId": 1,
-      "body": "Zm9vYmFyego",
-      "timestamp": 1234,
-      "online": false
-    }
-  ]
-}
diff --git a/service/src/test/resources/fixtures/online_message_true.json b/service/src/test/resources/fixtures/online_message_true.json
deleted file mode 100644
index 6fd0a6a61..000000000
--- a/service/src/test/resources/fixtures/online_message_true.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "online": true,
-  "messages": [
-    {
-      "type": 1,
-      "destinationDeviceId": 1,
-      "body": "Zm9vYmFyego",
-      "timestamp": 1234
-    }
-  ]
-}
diff --git a/service/src/test/resources/fixtures/online_message_true_nested_property.json b/service/src/test/resources/fixtures/online_message_true_nested_property.json
deleted file mode 100644
index 3437cc17f..000000000
--- a/service/src/test/resources/fixtures/online_message_true_nested_property.json
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "messages": [
-    {
-      "type": 1,
-      "destinationDeviceId": 1,
-      "body": "Zm9vYmFyego",
-      "timestamp": 1234,
-      "online": true
-    }
-  ]
-}