Crist Clark <[EMAIL PROTECTED]> 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