[courier-users] Re: 451 4.1.8 Domain of sender address ... does not resolve

Tue, 02 Dec 2003 17:08:51 -0800

Bowie Bailey writes:

I'm not sure why I am seeing these messages from some mail servers:

451 4.1.8 Domain of sender address [EMAIL PROTECTED] does not resolve

The dns is fine as far as I can tell. A dig for buc.com on my external dns
server gives me this:

    ;; ANSWER SECTION:
    buc.com.                28800   IN      MX      20 compass2.buc.com.
    buc.com.                28800   IN      MX      10 compass.buc.com.
    buc.com.                28800   IN      NS      compass2.buc.com.
    buc.com.                28800   IN      NS      compass.buc.com.
    buc.com.                28800   IN      A       205.245.136.11
    buc.com.                28800   IN      SOA     compass.buc.com.
bucadmin.buc.com. 2003110403 10800 1800 604800 28800

    ;; ADDITIONAL SECTION:
    compass.buc.com.        28800   IN      A       205.245.136.165
    compass2.buc.com.       28800   IN      A       205.245.136.166

I've got MX and A records, what else do I need?

Nothing.

So a router or a circuit somewhere hiccupped, and the recipient domain's nameserver could not briefly contact your name servers.

Wait for the problem to go away.




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