diff --git a/test/api/unit/libs/slack.js b/test/api/unit/libs/slack.js
index 58cbab04f3..4b6acdf695 100644
--- a/test/api/unit/libs/slack.js
+++ b/test/api/unit/libs/slack.js
@@ -32,6 +32,7 @@ describe('slack', () => {
         },
         message: {
           id: 'chat-id',
+          username: 'author',
           user: 'Author',
           uuid: 'author-id',
           text: 'some text',
@@ -54,7 +55,7 @@ describe('slack', () => {
         attachments: [{
           fallback: 'Flag Message',
           color: 'danger',
-          author_name: `Author - author@example.com - author-id\n${timestamp}`,
+          author_name: `@author Author (author@example.com; author-id)\n${timestamp}`,
           title: 'Flag in Some group - (private guild)',
           title_link: undefined,
           text: 'some text',
diff --git a/test/api/v3/integration/chat/POST-chat.flag.test.js b/test/api/v3/integration/chat/POST-chat.flag.test.js
index d93c199c63..723715c80b 100644
--- a/test/api/v3/integration/chat/POST-chat.flag.test.js
+++ b/test/api/v3/integration/chat/POST-chat.flag.test.js
@@ -67,7 +67,7 @@ describe('POST /chat/:chatId/flag', () => {
       attachments: [{
         fallback: 'Flag Message',
         color: 'danger',
-        author_name: `${anotherUser.profile.name} - ${anotherUser.auth.local.email} - ${anotherUser._id}\n${timestamp}`,
+        author_name: `@${anotherUser.auth.local.username} ${anotherUser.profile.name} (${anotherUser.auth.local.email}; ${anotherUser._id})\n${timestamp}`,
         title: 'Flag in Test Guild',
         title_link: `${BASE_URL}/groups/guild/${group._id}`,
         text: TEST_MESSAGE,
@@ -102,7 +102,7 @@ describe('POST /chat/:chatId/flag', () => {
       attachments: [{
         fallback: 'Flag Message',
         color: 'danger',
-        author_name: `${newUser.profile.name} - ${newUser.auth.local.email} - ${newUser._id}\n${timestamp}`,
+        author_name: `@${newUser.auth.local.username} ${newUser.profile.name} (${newUser.auth.local.email}; ${newUser._id})\n${timestamp}`,
         title: 'Flag in Test Guild',
         title_link: `${BASE_URL}/groups/guild/${group._id}`,
         text: TEST_MESSAGE,
diff --git a/website/server/libs/slack.js b/website/server/libs/slack.js
index f0807ce970..0adaf24894 100644
--- a/website/server/libs/slack.js
+++ b/website/server/libs/slack.js
@@ -41,7 +41,7 @@ try {
  * @returns {string}
  */
 function formatUser (formatObj) {
-  return `@${formatObj.name} ${formatObj.displayName} (${formatObj.email}; ${formatObj.uuid}`;
+  return `@${formatObj.name} ${formatObj.displayName} (${formatObj.email}; ${formatObj.uuid})`;
 }
 
 function sendFlagNotification ({