I frequently mail attachments from my Yahoo address to Thunderbird address. Recently these messages stopped arriving in my inbox. Thunderbird receives attachments from other sources, mostly sending to myself for testing. Yahoo sends attachments to other addresses as I have tested on several friends. It appears that the Yahoo account is performing as it should. One other clue I worry about is that I never ever see spam or junk emails in Thunderbird and I have no idea where they go.

Thanks to anyone willing to give advice. Roger