[quote user="Shades"]
I may have missed something but why not just right_click & "Re-Send", it will need doing for each message but is quick enough
[/quote]
Sounds like it would have been a much better way for me to deal with the problem. Wish I had known about it. [:S] I never thought to right click there. Nevertheless, the alternate SMTP provider has been a really good solution, but thanks for the clue.
I've sent David a logfile of a failed session I just created. It appears to proceed normally, accepts all of my test message, but then ends with:
07:16:20.214: >> 550 Request failed; Mailbox unavailable<cr><lf>
07:16:23.520: << QUIT<cr><lf>
07:16:23.577: >> 221 Service Closing transmission<cr><lf>
07:16:23.580: [!] Warning: SSL connection improperly closed by remote host.
This seems to confirm my guess that AT&T downsized the size of their SMPT, and probably also their POP3, server farms, simply because most people use webmail these days. I doubt if AT&T has any interest in going back, and would really prefer that we all just give up and disappear. The alternate SMTP server turns out to be a really good solution for me, because I also use a non-AT&T POP3 server, so this means that I'm no longer dependent on my ISP for email services, making it much easier for me to change ISPs.