diff --git a/addons/mail/static/src/components/message_list/message_list.js b/addons/mail/static/src/components/message_list/message_list.js
index 224d3a65c3a..650b2e2e1a3 100644
--- a/addons/mail/static/src/components/message_list/message_list.js
+++ b/addons/mail/static/src/components/message_list/message_list.js
@@ -106,6 +106,7 @@ export class MessageList extends Component {
                     // saved position if it exists or scroll to the end
                     this._adjustScrollFromModel();
                     break;
+                case 'message-posted':
                 case 'message-received':
                 case 'messages-loaded':
                 case 'new-messages-loaded':
diff --git a/addons/mail/static/src/models/composer_view.js b/addons/mail/static/src/models/composer_view.js
index 35a24c018df..76473c095b4 100644
--- a/addons/mail/static/src/models/composer_view.js
+++ b/addons/mail/static/src/models/composer_view.js
@@ -369,13 +369,15 @@ registerModel({
                 for (const threadView of message.originThread.threadViews) {
                     // Reset auto scroll to be able to see the newly posted message.
                     threadView.update({ hasAutoScrollOnMessageReceived: true });
+                    threadView.addComponentHint('message-posted', { message });
                 }
                 if (chatterThread) {
                     if (this.exists()) {
                         this.delete();
                     }
                     if (chatterThread.exists()) {
-                        chatterThread.fetchData(['followers', 'suggestedRecipients']);
+                        // Load new messages to fetch potential new messages from other users (useful due to lack of auto-sync in chatter).
+                        chatterThread.fetchData(['followers', 'messages', 'suggestedRecipients']);
                     }
                 }
                 if (threadViewThread) {
diff --git a/addons/mail/static/src/models/thread_cache.js b/addons/mail/static/src/models/thread_cache.js
index 1b480e49ae8..8ad1553c8c3 100644
--- a/addons/mail/static/src/models/thread_cache.js
+++ b/addons/mail/static/src/models/thread_cache.js
@@ -54,7 +54,7 @@ registerModel({
             }
             const messageIds = this.fetchedMessages.map(message => message.id);
             const fetchedMessages = this._loadMessages({ minId: Math.max(...messageIds) });
-            if (!fetchedMessages) {
+            if (!fetchedMessages || fetchedMessages.length === 0) {
                 return;
             }
             for (const threadView of this.threadViews) {