XF 1.3 Email Suddenly Stopped

Main Company

Active member
On Tuesday I stopped receiving email notifications from the board. Nothing has changed, same server, same host, no changes to email system. The only thing I can think of is I ran acp > tool > clean up permissions on Tuesday. Perhaps I using another cache cleaning tool as well on that day, not sure. Anyone have any suggestions on how to diagnose the issue.
 
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