On Sat, 27 Sep 2003 16:44:18 +0200, =?ISO-8859-1?Q?M=E5ns_Nilsson?= <[log in to unmask]>  said:
> --On Thursday, September 25, 2003 22:03:17 -0400 John Lyon
> <[log in to unmask]> wrote:
> 
> > A simple Whois reveals:
> >
> >  Domain Name: JUNO.COM
> 
> Per the SMTP RFCen they must read [log in to unmask] Try that.

RFC2821, section 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.  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.

   SMTP systems are expected to make every reasonable effort to accept
   mail directed to Postmaster from any other system on the Internet.
   In extreme cases --such as to contain a denial of service attack or
   other breach of security-- an SMTP server may block mail directed to
   Postmaster.  However, such arrangements SHOULD be narrowly tailored
   so as to avoid blocking messages which are not part of such attacks.

Note that it says that 'postmaster' is required to *accept* mail.  There is no
actual requirement that it be read or understood.  They're just not allowed to
bounce it.