-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
David F. Skoll wrote: | On Mon, 31 Jan 2005, Adam Lanier wrote: | | |>Technically, a server can generate mail (legally according to RFC's) |>without having an MX record. Only servers that RECEIVE mail need to |>have an MX record. | | | They don't need to have an MX record; an A record will do. | | roaringpenguin.com, for example, has an A record. If roaringpenguin.com | had no MX records, then mail for [EMAIL PROTECTED] would go to the | A record. | | |>What needs to be in place is a valid return path for the mail that is |>generated. So, while server 'mailout.example.com' can generate mail |>from the domain 'example.com' with only an A record, some server |>somewhere SHOULD (again, according to RFC's) have an MX record for the |>domain 'example.com'. If there is no MX record for the domain |>'example.com' then the 'mailout.example.com' will be used as the return |>path for the generated mail. | | | No; if there's no MX record for "example.com", then the A record for | "example.com" will be used, if it exists. If no A record exists either, | then it will be impossible to mail [EMAIL PROTECTED] | | -- | David.
Understood David and that's pretty much what my reply had said or, at least, that's what I had intended it to say.
An MX record is required to RECEIVE mail not to send it. An A record will be used if no MX record is available. Without an A record, no mail can be sent to the domain in question.
The point being that checking for both an MX and A record is somewhat pointless in regards to determining whether mail from the host is 'valid' or 'spam'.
- -- Adam Lanier Bernard L. Madoff Investment Securities LLC -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.2.6 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://enigmail.mozdev.org
iD8DBQFB/nBsyiJGTGcJL0cRAnivAJoCAtG7fInyTksDSUcZld91Wwtx1ACcC8E2 K2Rao16uHywku9qBaz1GWE8= =odQ7 -----END PGP SIGNATURE----- _______________________________________________ Visit http://www.mimedefang.org and http://www.canit.ca MIMEDefang mailing list [email protected] http://lists.roaringpenguin.com/mailman/listinfo/mimedefang
