Do you occasionally send email to yourself? Has it started going to your Deleted items folder? You may have accidentally added your own address to your spam filter’s enemy list or reported yourself as spam.
“Huh? I’m not that dumb!” you reply.
Neither am I, but the other day I was going through my Inbox and deleting spam when I noticed that it forged my email address as the sender. So, if I clicked it as spam, added it to my enemy list, or reported it, I would be reporting myself!
So, look before you report, banish, or block. You may be punishing yourself. Check your filter’s enemy list or your message rules to see if you’re being blocked
David Samuel Thomas