nwrickert
sand groper
Premium,MVM
join:2004-09-04
Geneva, IL
 ·AT&T U-Verse
 ·AT&T Midwest
| reply to MikeStammer
Re: Warning: SBC Yahoo SMTP Auth possibly broken
I can't help you with postfix. I use sendmail.
I can comment for sendmail users.
I just tried sending mail, and it worked fine the first try. But it would not have worked if I had a default configuration.
I am supposed to send email to "smtp.ameritech.yahoo.com". That used to be a CNAME for "smtp-sbc-v1.mail.vip.sc5.yahoo.com" or something similar. Incidently, I just copied that name from MikeStammer  's post, since it looked familiar.
With a standard sendmail configuration, my authentication table entry would have needed to specify authentication for "smtp-sbc-v1.mail.vip.sc5.yahoo.com", or just for "yahoo.com" since it applies to abbreviations.
What has changed, is that now, "smtp.ameritech.yahoo.com" appears to be a CNAME for "smtp-sbc.mail.yahoo.com" which, in turn, is a CNAME for "smtp.sbc.mail.yahoo4.akadns.net". So my authentication table entry would need to specify "smtp.sbc.mail.yahoo4.akadns.net" as the host, or just "akadns.net" would do.
However, I have configured
define(`confDONT_EXPAND_CNAMES', `True')
and, as a result, sendmail does not expand CNAMEs. This way my authentication table entry should be for "smtp.ameritech.yahoo.com" or for just "yahoo.com". And that's likely to not change, even when they alter the CNAME. Or at least it is not likely to change without prior notification to SBC users.
I don't know if this will help you with postfix, but perhaps it at least helps explain part of what is going on. |
