Re: Weird DNS issues for domains

[abuse () cabal org uk (Peter)]

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