Whether or not an email is sent or received depends on the specific Salesforce Chatter @mention scenario. For example, a user who is @mentioned in a Chatter comment on an Opportunity record may report that they did not receive an email notification. This behavior depends on specific Chatter @mention conditions and email deliverability settings configured in the Salesforce org. The information below assists in troubleshooting when email is not received for Salesforce Chatter @mentions.
Update Your Email Notifications in Chatter
Guidelines for Managing Your Personal Chatter Email Settings
Monitoring and understanding email logs:
Salesforce Idea Exchange - Enable @ and / Chatter mentions on all records
Trailblazer Community - Users not receiving email notifications for Chatter messages
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