Hi,

I know others are having the same problem and I tried all the suggestions I saw but no change. I changed Port to 587 as suggested somewhere but it was 465 before. I saw the suggestions for other providers such as earthlink but I did not see any post that involves att server. "The outgoing server requires authentication" was checked even before this problem started. Thank you.

Akiko

An unknown error has occurred.

Server: 'smtp.att.yahoo.com'
Windows Live Mail Error ID: 0x80070057
Protocol: SMTP
Port: 587
Secure(SSL): Yes

[Original title: I cannot send emails with windows live mail]