Can't send myself email messages
Have had for few years now. For about 3-4 days now can't send myself emails. Get error message>Your message wasn't delivered because the recipient's email provider rejected it. Remote Server returned '550 5.7.520 Message blocked because it contains content identified as spam. AS(4810)'
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That error message is originating from you providers server, not Thunderbird. 550 5.7.520 formatted errors are always from the server, even if Thunderbird delivers them. I would guess you provider has decided mail from you to you is spam and is no longer delivering it.