User Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0 Build ID: 20170303012758 Steps to reproduce: Several messages that I sent to several people including me get moved to junk folder, but not marked as junk Actual results: I marked them as not junk ( from menu and with 'J' key). The we moved back to Inbox. But shortly afterwards the got moved to junk folder again. I tried to move them back more than 20 times, restarted thunderbird and computer but it did not help. Expected results: After a 20 marking as not junk message with names in address book shouldn't be moved to junk.
I found that any message sent to myself goes to junk folder. This is something I never seen before until recently ( may be three days)
I think this may be a support issue rtather than a bug. Please ask at https://support.mozilla.org/t5/Thunderbird/bd-p/Learn-Basics