issues with mcd.com DNS

[Simon Waters]

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Dave Lugo wrote:
>
> On my DNS server, I can query for mcd.com's MX, with no problem.
>
> On other boxes in the same subnet as my DNS server, that same query
> against my DNS server fail.

Be absolutely clear on what is a client and what is a server in this
context.

In the context of say running "dig" with no server specificied, the
chances are if you run it on your DNS server or elsewhere on your
network the query to the nameserver is identical.

So either some of these boxes are using another DNS server, or there is
more to this than you've managed to describe/uncover.

> As for mcd.com's somewhat broken DNS configuration, it's not something I
> am able to resolve myself, but I have pointed it out to them.  I'm not
> sure that their b0rkeness is what is causing my problem

With only one DNS server and a 15 minute TTL they shouldn't expect their
 MX to resolve reliably. If it is that important to email these people
quickly you could put a hack in your MTA configuration, but far better
for them to sort their DNS.

I think that usually such a borked configuration would work, but the C&W
secondary is returning SERVFAIL rather than a referral, and it is too
early for me to figure out what that means, but I'd guess it ain't
helping matters.

However is your mail not still queued, your end, waiting for a
successful resolution of the MX for the domain ?
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