Mark the message 'As Not Junk'.

I do and the next time I get one, it too is marked as junk. Junk never learns.

Who is your email provider?

I have 4 and it does this all of them. Gmail is one.

If your accounts are IMAP, try to log on to your account via webmail, and mark those messages as 'Not Junk' on the server.

All are POP3.

What anti virus do you have that is purporting help you with your security and probably messing up your mail?

Turn off ALL mail related functions in the anti virus, scanning scam detection and spam and phishing stuff and see if you new mail still gets marked as spam.

I also have legit messages going to Bulk Mail that are not junk and have done everything that is suggested in this and other posts on this topic:

• Verified that Thunderbird is flagging these messages, not the provider
• Regular try to train Thunderbird by clicking "Not Junk" for these messages (when I do, they appropriately and automatically go to the Inbox)
• Put the "good" addresses in my address book
• Set "Do not automatically mark mail as junk" for both Collected and Personal addresses
• Clicked "Reset Training Data"
• Disable "Allow antivirus clients to quarantine individual incoming messages"

I see MANY posts in this forum about it which tells me there is a lot of time wasted by many on this. If not a bug, then it is something way too complicated and could be be simplified.

Anyone have any other suggestions...?