On Wed, Apr 24, 2002 at 08:07:35PM -0400, Duncan Findlay wrote: | On Wed, Apr 24, 2002 at 12:09:03PM -0700, Bart Schaefer wrote: | > On Wed, 24 Apr 2002, Vivek Khera wrote: | > | > > If there is such an RFC, how would I then use my personal email address, | > > [EMAIL PROTECTED], if there is no machine with that domain name assigned | > > to its IP address (it is a virtual address)? | > | > Even if there isn't a machine with an "A" record for khera.org, there | > must be one with an MX record for it or mail can't be delivered to it: | | Are you sure? daf.2y.net just has an "A" record... I get mail just fine...
RFC2821 :
5. Address Resolution and Mail Handling
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. If one or more MX RRs are found for a
given name, SMTP systems MUST NOT utilize any A RRs associated
with that name unless they are located using the MX RRs; the
"implicit MX" rule above applies only if there are no MX records
present. If MX records are present, but none of them are usable,
this situation MUST be reported as an error.
You *should* have MX record(s), but in their absence A record(s) will
suffice. Many/some spammers won't bother setting up MX records, which
is why SA has a test for that. All "real" sites will setup MX
records. (ddts supports user-specified MX records, I don't know about
dyndns or other services)
-D
--
Many are the plans in a man's heart,
but it is the Lord's purpose that prevails.
Proverbs 19:21
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