Thunderbird marking ALL email as Spam
Currently running Windows 10 and Thunderbird 115.5.0 (64-bit). All new email coming into my Thunderbird inbox from my gmail account is being marked as Spam, red flame. But is left in the inbox. Earlier in the day I went to Tools > Settings > Privacy & Security and selected "Reset Training Data" thinking that might be how/why things were getting marked as spam. Several hours later I have 7 new messages, all marked as spam. I to Gmail's web interface and the messages are all there and none are marked as spam. I checked the Log of Junk mail and I do not see any of the subject lines there.
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generally post update if all mail is marked as junk/spam it is the result of defective injected spam/junk functions for an antivirus program. If you antivirus has such functions, try turning them off and see if the issue resolves.
Thanks Matt, the only antivirus I have running is Windows Defender. It has never caused an issue before (I've been using Thunderbird >7 years) I manually deleted the junk log and Reset Training Data yesterday. This morning, nothing unusual was marked as junk / spam.