On Thu, 13 Jun 2002, David Robb wrote:
On Thu, 13 Jun 2002, Juha Saarinen wrote:
Yeah, Microsoft does send out emails from passport.com with return addresses like PPMSVCMG(a)PASSPORT.COM even though there are no MX records for the domain.
Unless RFC 974 has been superceeded :
It is possible that the list of MXs in the response to the query will be empty. This is a special case. If the list is empty, mailers should treat it as if it contained one RR, an MX RR with a preference value of 0, and a host name of REMOTE. (I.e., REMOTE is its only MX). In addition, the mailer should do no further processing on the list, but should attempt to deliver the message to REMOTE. The idea here is that if a domain fails to advertise any information about a particular name we will give it the benefit of the doubt and attempt delivery.
It has been, according to my copy of rfc-index.txt; this is now covered in RFC 2821, section 5: ---------- Cut Here ---------- The lookup first attempts to locate an MX record associated with the name. If a CNAME record is found instead, the resulting name is processed as if it were the initial name. If no MX records are found, but an A RR is found, the A RR is treated as if it was associated with an implicit MX RR, with a preference of 0, pointing to that host. ---------- Cut Here ---------- The problem is that passport.com has no MX records, and the A for it doesn't accept SMTP connections (but they insist on sending out mail with @passport.com envelope senders, as has been noted here). Cheers R -- Richard Stevenson Systems Specialist Xtra Limited - To unsubscribe from nznog, send email to majordomo(a)list.waikato.ac.nz where the body of your message reads: unsubscribe nznog