Att.net is reporting a DNS lookup failure on a domain I run. I don't
see any problems but just curious if anyone is familiar with issues
with att.net or might have an idea what might be the problem.
A sanity check, if you will.
I host a domain whmoseley.com. One sender can only get mail through
about 1 in 5 tries. Most of the time she gets a bounce:
From: postmaster@??? (Webmail Postmaster)
To: ******@att.net
Subject: Returned mail: User unknown
Date: Thu, 25 Jan 2007 20:31:17 +0000
The following addresses had fatal errors:
*****@whmoseley.com: 550 [PERMFAIL] destination not valid within DNS
Which is not the most helpful message -- "User unknown" in the subject
but the DNS error in the body. And no other info, like what server
had the DNS lookup error.
That message never got to my Exim4 machine. The domain gets fifty or
so other emails a day without any problems. But this one user
consistently has problems.
The only thing odd about that domain is that there's no A DNS record
only an MX -- which shouldn't be a problem.
The dns boxes are on the same sub-net, which is not great, but doesn't
explain why it's only that one sender with problems.
$ dig mx whmoseley.com. | grep mail
whmoseley.com. 86400 IN MX 5 mail.whmoseley.com.
$ dig a mail.whmoseley.com. | grep 170
mail.whmoseley.com. 86368 IN A 63.205.225.170
Or:
$ host whmoseley.com
whmoseley.com mail is handled by 5 mail.whmoseley.com.
$ host mail.whmoseley.com
mail.whmoseley.com has address 63.205.225.170
Any ideas?
--
Bill Moseley
moseley@???
