I sent 4 e-mails in the usual way to about 12 individuals. When I tried to review the e-mails recently they were not in my Sent folder. I eventually found them in my Junk folder; there were no other e-mails in the folder nor was the folder title shown bold. All had the yellow "Thunderbird thinks this is junk" message header. I checked with a recipient and the e-mails were received OK. Any explanation of the cause of the problem or advice on how to prevent a recurrence would be appreciated.

Richard