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> Hi, Wietse. Thanks for the speedy reply. I'm a big fan of Postfix, so first
> of all, thank you for developing such a great product. I cringe thinking
> about the days when I used to have to run Sendmail (shudder).
> Ok... so let me see if I understand what is happening on my server.
> 1) SpamCo forges a message from firstname.lastname@example.org and sends it to
> 2) My server (familyname.com) accepts the message because myaunt@familyname
> is a valid recipient that appears in my virtual aliases file, then forwards
> the message (based on the info in that virtual aliases file) to my aunt's
> actual email address of email@example.com
> 3) Cox.net rejects the mail because it's SPAM and sends it back to the
> spoofed "sender": firstname.lastname@example.org, basically saying "your message to
> email@example.com was rejected because of xyz reason"
Cox rejects the message; YOUR box sends it back to an innocent person.