RFC 822 заявляет:
 6.3.  RESERVED ADDRESS
      It often is necessary to send mail to a site, without  know-
 ing  any  of its valid addresses.  For example, there may be mail
 system dysfunctions, or a user may wish to find  out  a  person's
 correct address, at that site.
      This standard specifies a single, reserved  mailbox  address
 (local-part)  which  is  to  be valid at each site.  Mail sent to
 that address is to be routed to  a  person  responsible  for  the
 site's mail system or to a person with responsibility for general
 site operation.  The name of the reserved local-part address is:
                            Postmaster
 so that "Postmaster@domain" is required to be valid.
 Note:  This reserved local-part must be  matched  without  sensi-
        tivity to alphabetic case, so that "POSTMASTER", "postmas-
        ter", and even "poStmASteR" is to be accepted.
Кроме того, RFC 5321 заявляет:
4.5.1.  Minimum Implementation
[...]
Any system that includes an SMTP server supporting mail relaying or
delivery MUST support the reserved mailbox "postmaster" as a case-
insensitive local name.  [...]  The requirement to accept mail for
postmaster implies that RCPT commands that 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.
SMTP systems are expected to make every reasonable effort to accept
mail directed to Postmaster from any other system on the Internet.
Когда пользователь сети сталкивается с доменом, который не может вести себя соответствующим образом, есть ли что-то, что он / она может сделать, чтобы заставить контроллер домена применять RFC, кроме отправки домена в rfc-clueless.org (замена rfc-ignorant.org))?
