diff --git a/lib/actions/message-actions.js b/lib/actions/message-actions.js
--- a/lib/actions/message-actions.js
+++ b/lib/actions/message-actions.js
@@ -5,6 +5,7 @@
 import type {
   FetchMessageInfosPayload,
   SendMessageResult,
+  SendReactionMessageResult,
   SimpleMessagesPayload,
 } from '../types/message-types';
 import type { MediaMessageServerDBContent } from '../types/messages/media.js';
@@ -201,6 +202,41 @@
   success: 'SEND_REACTION_MESSAGE_SUCCESS',
   failed: 'SEND_REACTION_MESSAGE_FAILED',
 });
+const sendReactionMessage = (
+  callServerEndpoint: CallServerEndpoint,
+): ((
+  threadID: string,
+  targetMessageID: string,
+  reaction: string | null,
+) => Promise<SendReactionMessageResult>) => async (
+  threadID,
+  targetMessageID,
+  reaction,
+) => {
+  let resultInfo;
+  const getResultInfo = (passedResultInfo: CallServerEndpointResultInfo) => {
+    resultInfo = passedResultInfo;
+  };
+  const response = await callServerEndpoint(
+    'create_reaction_message',
+    {
+      threadID,
+      targetMessageID,
+      reaction,
+    },
+    { getResultInfo },
+  );
+  const resultInterface = resultInfo?.interface;
+  invariant(
+    resultInterface,
+    'getResultInfo not called before callServerEndpoint resolves',
+  );
+  return {
+    id: response.newMessageInfo.id,
+    newMessageInfo: response.newMessageInfo,
+    interface: resultInterface,
+  };
+};
 
 const saveMessagesActionType = 'SAVE_MESSAGES';
 const processMessagesActionType = 'PROCESS_MESSAGES';
@@ -220,6 +256,7 @@
   sendMultimediaMessage,
   legacySendMultimediaMessage,
   sendReactionMessageActionTypes,
+  sendReactionMessage,
   saveMessagesActionType,
   processMessagesActionType,
   messageStorePruneActionType,
diff --git a/lib/types/message-types.js b/lib/types/message-types.js
--- a/lib/types/message-types.js
+++ b/lib/types/message-types.js
@@ -518,6 +518,13 @@
   +time: number,
   +interface: CallServerEndpointResultInfoInterface,
 };
+
+export type SendReactionMessageResult = {
+  +id: string,
+  +newMessageInfo: RawMessageInfo,
+  +interface: CallServerEndpointResultInfoInterface,
+};
+
 export type SendMessagePayload = {
   +localID: string,
   +serverID: string,