On Fri, 18 Jun 2004, at 11:13am, [EMAIL PROTECTED] wrote:
> A colleague has indicated tome mail should still get delivered even
> without an MX record ...
RFC-821/2821 specify that if a domain has no MX RR (Resource Record) but
does have an A RR, attempt delivery using that IP address.
From RFC-2821, Section 5, Paragraph 1: "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."
> When I do an nslookup, setting type=mx, it does return an mail server.
ici.net does not have any MX records, nor does it have any A records.
Thus, standard mail delivery to that domain is not possible.
$ sdig ici.net. @a.gtld-servers.net. ANY
ici.net. 172800 IN NS chartis.naii.net.
ici.net. 172800 IN NS diorizo.naii.net.
ici.net. 172800 IN NS metafrazo.naii.net.
ici.net. 172800 IN NS onoma.naii.net.
$ sdig ici.net. @chartis.naii.net. ANY
ici.net. 14400 IN NS kirk.ici.net.
ici.net. 14400 IN NS spock.ici.net.
ici.net. 14400 IN NS diorizo.naii.net.
ici.net. 14400 IN SOA kirk.ici.net. dns.ici.net.
$
> ... and the recipient indicates he does in fact receive email from other
> outside sources.
I do not think he is seeing what he thinks he is seeing. Ask him to
forward one of his messages to you, with full headers intact.
--
Ben Scott <[EMAIL PROTECTED]>
| The opinions expressed in this message are those of the author and do |
| not represent the views or policy of any other person or organization. |
| All information is provided without warranty of any kind. |
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