I have AT&T Uverse, and I also get that msg. once in a while. I also got that when I used Comcast cable years ago. My impression is that the msg. is triggered whenever your carrier has the e-mail system offline for periodic maintenance.

Lee wrote:
Hi, same here, also can save it as a draft and it will usually go out
with no problems. Also I have security and authentication block checked
and it works for me most of the time and
if I have a problem I un check it and try to send with negative
results and then put it back to checked and it works. I also have
Yahoo, with vista as an OS. Hmm go figure !!

Rostyslaw Lewyckyj wrote:
Recently my system has begun to issue the following error
when I try to send out emails on this account:
"Sending of message failed. An error occurred sending mail:
Unable to authenticate to SMTP server smtp.att.yahoo.com.
It does not support authentication (SMTP-AUTH) but you have
chosen to use authentication. Uncheck 'use name and password'
for that server or contact your server provider"

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