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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Postmaster 'best practices' query
Yo David! On Mon, 22 Oct 2001, David Lesher wrote: > Every site should accept/respond to "postmaster" -- T/F? RFC2821: " Any system that includes an SMTP server supporting mail relaying or delivery MUST support the reserved mailbox "postmaster" as a case- insensitive local name. This postmaster address is not strictly necessary if the server always returns 554 on connection opening (as described in section 3.1). The requirement to accept mail for postmaster implies that RCPT commands which specify a mailbox for postmaster at any of the domains for which the SMTP server provides mail service, as well as the special case of "RCPT TO:<Postmaster>" (with no domain specification), MUST be supported.' > Or is it "Every site running mail".... > Or every box running mail? I infer all the above from RFC2821 above. > IOW: Which of the following are required vice recommended vice > best practives, etc. > > a) [email protected] Surely required. RFC2821 above. > b) [email protected] Required IFF mail.example.com has an SMTP daemon: RFC1123: 'A host that supports a receiver-SMTP MUST support the reserved mailbox "Postmaster".' > c) [email protected] > d) [email protected] > e) [email protected] Not required, but encouraged, RFC 2142: " For well known names that are not related to specific protocols, only the organization's top level domain name are required to be valid. For example, if an Internet service provider's domain name is COMPANY.COM, then the <[email protected]> address must be valid and supported, even though the customers whose activity generates complaints use hosts with more specific domain names like SHELL1.COMPANY.COM. Note, however, that it is valid and encouraged to support mailbox names for sub-domains, as appropriate." Postmaster is related to a protocol (SMTP) so this does not exactly apply. Still, my logs show sending mail to sub-domains is a very common practice so I always MX all subdomains. I find this confirmed in RFC1123: "Be liberal in what you accept, and conservative in what you send" > and most important to me: where to I go to justify the > decisions on same? RFC822, RFC1123, RFC2142, RFC2821. RGDS GARY --------------------------------------------------------------------------- Gary E. Miller Rellim 20340 Empire Blvd, Suite E-3, Bend, OR 97701 [email protected] Tel:+1(541)382-8588 Fax: +1(541)382-8676
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