"host" performs A, AAAA and MX queries, by default. If you want to limit
it to a specific query type, use the "-t" option.
Having said that, I didn't get an NXDOMAIN for any of the query types,
from any of the delegated nameservers, when using dig, but I'm getting
SERVFAILs when using host, *after* the initial A-record query (as seen
in debug mode). I'm not that familiar with "host" to be able to
troubleshoot this very easily. The 0-second-TTL on the record probably
isn't helping. It seems likely (rad = Radware, probably) that it's
actually load-balancing devices answering these queries, rather than
actual nameservers.
Last but not least, it's not legal to point an MX record at an *alias*,
and that's probably the root cause of your main problem (sendmail
failures) here...
- Kevin
On 9/20/2013 6:51 PM, Howard Leadmon wrote:
This is probably easier than I am making it, but my googlefu seems to be
failing me at the moment when I look around. I handle a batch of FreeBSD
servers running sendmail, and I am having a site that is trying to deliver
mail being rejected, but they swear their DNS is right, so I am not sure if
we have an issue, or they do.
I am seeing sendmail rejects like this:
Sep 20 14:45:59 mail3 mail3-smtp[15388]: r8JE8kQg099367:
to=<jmetey...@panini.co.uk>, delay=1+04:37:10, xdelay=00:00:31,
mailer=esmtp, pri=5259883, relay=smtp2.panini.co.uk., dsn=4.0.0,
stat=Deferred: Name server: smtp2.panini.co.uk.: host name lookup failure
If I take and run a host lookup, I get a response like this:
$ host panini.co.uk
panini.co.uk mail is handled by 10 smtp.panini.co.uk.
panini.co.uk mail is handled by 20 smtp2.panini.co.uk.
Now if I try that on any of the hosts that should accept the mail, I see:
$ host smtp.panini.co.uk
smtp.panini.co.uk is an alias for smtp.panini.it.
smtp.panini.it has address 151.12.160.24
Host smtp.panini.it not found: 3(NXDOMAIN)
$ host smtp2.panini.co.uk
smtp2.panini.co.uk is an alias for smtp2.panini.it.
smtp2.panini.it has address 151.12.160.30
Host smtp2.panini.it not found: 3(NXDOMAIN)
So I get the IP address returned, but then an NXDOMAIN that follows. I do
have the BrokenAAAA config option in my sendmail, so know it's not that, or
I don't think so. Yet if I do a dig on the hosts, they seem to come back
with an IP address as expected, and shown above.
So if anyone can offer a clue on this, it would be appreciated..
---
Howard Leadmon
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