Am 02.02.2012 16:36, schrieb Dennis Putnam:
> Actually it is AT&T and they subcontract out their mail services to Yahoo. 
> That is the transition I am trying to
> resolve. However, you have jogged something in my mind. Although my Postfix 
> is authenticating as a legitimate user
> to the yahoo server, the mail being sent is from a different, albeit, 
> legitimate user. I wonder if the
> authenticated user has to match the MAIL FROM user?

would you PLEASE reply to the list and not permanently only to me
and put your answer BELOW the other one to make a thread readable?

yes it is possible and not uncommon that the sender must match the login
postfix does this with "reject_authenticated_sender_login_mismatch" and
it is not unusual to prevent outgoing mails spoofing the sender



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