[84997] in North American Network Operators' Group
Re: Weird DNS issues for domains
daemon@ATHENA.MIT.EDU (Peter)
Fri Sep 30 03:42:09 2005
To: nanog@nanog.org
From: abuse@cabal.org.uk (Peter)
Date: Fri, 30 Sep 2005 07:41:26 +0000 (UTC)
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Crist Clark <crist.clark@globalstar.com> wrote:
[...]
> The problem I've seen is when an SMTP server does not accept emails
> which have non-resolvable MAIL FROM domain. When the sender is a
> dumb SMTP client, not an MTA, this can cause problems.
Well, that "dumb SMTP client" should stop pretending to be a MTA then.
If it can't queue and retry, it shouldn't even *think* about looking
for MX records.
Besides, what sort of "dumb SMTP client" did you have in mind?
Formmail scripts? Worms? Outlook Express? I can't say I'd miss mail
from any of those.
> (I noticed this happen to a high traffic customer who had both of
> their DNS servers in the same /24 located in Slidell, LA. Needless
> to say, they were down for more than a few hours when Katrina rolled
> through.)
Having reachable DNS isn't going to help anyway if the MX host is also
unreachable for an extended period. Mail is still going to bounce
after a few days if somebody doesn't fiddle with DNS.
--
'Twas a woman who drove me to drink, and I never had the courtesy to thank her
for it.
- W.C. Fields
