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Old 19 Feb 2021, 03:31 AM   #5
BritTim
The "e" in e-mail
 
Join Date: May 2003
Location: mostly in Thailand
Posts: 3,084
Even if you are pretty sure they are not responsible, carefully review your sieve Filters and Rules to see if the messages are being discarded, filed into an unexpected folder, or forwarded out of your FastMail account. Also, look at any aliases for your domain. It is true surprisingly often that some long forgotten Rule is suddenly causing issues like you describe.
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