wb8foz@nrk.com writes:
A query to help educate me. Feel free to flame away; the week is young.
Every site should accept/respond to "postmaster" -- T/F?
Or is it "Every site running mail".... Or every box running mail?
IOW: Which of the following are required vice recommended vice best practives, etc.
a) postmaster@example.com b) postmaster@mail.example.com c) postmaster@wizzbang.example.com d) postmaster@pop.example.com e) postmaster@cisco.example.com
and most important to me: where to I go to justify the decisions on same?
The Host Requirements RFC says that if you support "receiver SMTP", you must support the reserved mailbox "Postmaster". In my experience, interpreting that statement has been a pre-existing exercise for the readers for nearly a decade, with many results. In my humble opinion -- heavily dosed with Jon Postel's Robustness Principle -- that rule means that if SMTP mail succeeds to _any_ address for a specific right-hand side, then SMTP mail must also succeed to "postmaster" at that same right-hand side. So using your examples above, if I can send SMTP mail to foo@example.com, then I should be able to send SMTP mail to postmaster@example.com. I would hope that a real human being would be able to respond, but I realize it's unlikely. There may be other RFCs that cover this issue. Jim == Jim Duncan, Product Security Incident Manager, Cisco Systems, Inc. <http://www.cisco.com/warp/public/707/sec_incident_response.shtml> E-mail: <jnduncan@cisco.com> Phone(Direct/FAX): +1 919 392 6209