Users Not Receiving the Chatter daily digest email

If you are sure you should be getting the Chatter daily emails because either you were @mentioned, a group, record, or person you are following has updates, and you also confirmed through the email logs that the emails were sent out and were delivered successfully to the server with no errors, yet you don't receive any emails, it's possible that these emails are being cached by your company's spam filter.

We recommend you allowlist Salesforce IP addresses used for chatter in this article:
Ensure you can receive email from the Salesforce application

After allowlisting these addresses, you should receive the Chatter daily digest emails.

If you've ruled out IP allowlisting as a potential cause, it's important to know that there exists functionality built into the application to stop sending users Chatter Digest Emails due to inactivity and if they don't read their Chatter news feed for approximately 30+ days. Review the affected user's login history to ensure that they have successfully logged into Salesforce and viewed their Chatter Feed (Chatter tab > What I Follow) in the full application via a Supported browser.


See also:
Request an Email Log
February 2016 Chatter & Communities Mail IP Address Changes
Salesforce IP Addresses and Domains to Allow
Troubleshoot delivery problems for Salesforce emails