From: Ralf Hildebrandt (Ralf.Hildebrandtcharite.de)
Date: Thu Feb 02 2006 - 07:18:33 CST

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* Chip Mefford <cmefforderuditium.org>:

> Feb 2 07:36:53 smail postfix/smtp[4067]: 0A49211AE61:
> to=<-name-removed-nfcu.org>, relay=none, delay=161284, status=deferred
> (Name service error for
> name=nfcu.org type=MX: Host not found, try again)

As you can see, the MX lookup returns a TEMPORARY error. So Postfix
hopes to get a proper answer anytime soon.

> $ dig NS.NAVYFEDCU.ORG nfcu.org IN MX
>
> ; <<>> DiG 9.2.5 <<>> NS.NAVYFEDCU.ORG nfcu.org IN MX
> ; (1 server found)
> ;; global options: printcmd

> ;; connection timed out; no servers could be reached

see?

> Okay, I'm 'guessing' that since the dns server refuses to answer
> the MX request, that postfix is (fairly) figuring it will just
> defer the delivery until such a time as the dns server answers?

Yes. It refuses to give any answer.

> and if gives and answer of 0, it would then attempt the A record?

Yes.
try:

ignore_mx_lookup_error = yes

--
Ralf Hildebrandt (Ralf.Hildebrandtcharite.de) spamtrapcharite.de
Postfix - Einrichtung, Betrieb und Wartung Tel. +49 (0)30-450 570-155
http://www.postfix-buch.com
First Law of System Requirements:
   "Anything is possible if you don't know what you're talking about..."

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