On Monday 01 December 2008, John Blinka wrote:
> I recently switched to at&t from another isp.  At that other isp,
> my ssmtp setup worked perfectly.  With at&t, a similar ssmtp setup
> (modified appropriately to point to at&t's smtp server) does not
> work at all.
>
> AT&T told me to use the server smtp.att.yahoo.com and port
> 465.  So my ssmtp.conf file looks like:
>
>  Debug=YES
> root=xxx@att.net
> mailhub=smtp.att.yahoo.com:465
> AuthUser=xxx
> AuthPass=yyy
> rewriteDomain=att.net
> FromLineOverride=YES
> UseTLS=YES
>
> and my revaliases file looks like
>
> root=xxx@att.net:smtp.att.yahoo.com:465
>
> The result of the command mail -v -s test xxx@att.net is:
>
> [<-] 220 smtp122.sbc.mail.sp1.yahoo.com ESMTP
> [->] EHLO tobey
> [<-] 250 8BITMIME
> [->] AUTH LOGIN
> [<-] 334 VXNlcm5hbWU6
> [->] am9obi5ibGlua2E=
> [<-] 334 UGFzc3dvcmQ6
> [<-] 535 authorization failed (#5.7.0)
> send-mail: Authorization failed (535 authorization failed (#5.7.0))
> Can't send mail: sendmail process failed with error code 1
>
> I read somewhere that some people can't get at&t's port 465 to work
> with ssmtp and that they have used port 587 successfully.  Not so
> for me.  Using port 587 (replacing 465 by 587 in ssmtp.conf and
> revaliases), the result of mail -v -s test xxx@att.net is:
>
> SSL_connect: Success
> send-mail: Cannot open smtp.att.yahoo.com:587
> Can't send mail: sendmail process failed with error code 1
>
> I have no problem at all sending mail to my att.net account from
> various gmail accounts I use, so I know that my password and
> username combination functions.
>
> I can telnet to smtp.att.yahoo.com at either port 465 or 587 and get
> a response, so nothing is blocking either port.
>
> Any insights or suggestions?
>
> John Blinka

Have a go at adding:

UseSTARTTLS=YES

and remove:

UseTLS=YES

-- 
Regards,
Mick