Talk:Thunderbird

I'm using TB with an IMAP account (fastmail.fm). Although I had My IMAP account called my sent messages folder "Sent" while TB was trying to save to "Sent Items", so I renamed the folder in TB & all works fine.

I had the same issue and fixed it by taking off "sent" folder on my IMAP account selected other, then manually selecting the "sent message" folder. This solved it!