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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: mail does bounce (was: Customers down?)
> > I know for certain that Postfix and Smail will immediately bounce a > > message when the domain is authoritatively non-existant. I'd be very > > surprised and dismayed if sendmail and all other true SMTP mailers did > > not do exactly the same thing. > > Sendmail most definitely does not, instead treating the error as a > transient error, issuing an SMTP error code in the 400 series, and > continuing to try to send the mail for up to five days (the default), > or whatever the mail server admin configured for that particular > server. > > I think I like it better that way. Just because both nameservers are > temporarily down doesn't mean the domain doesn't exist. :P Seems to me you're talking past one another. If all nameservers for a domain are down there *is* no nameserver which can say that the domain is authoritatively non-existent. (OK, you could get a negative caching answer from one of the authoritative servers on the level above, but that's a different issue...) I agree with Greg Woods - if a domain is authoritatively non-existent, I'd expect a sane mailer to bounce the message. Steinar Haug, Nethelp consulting, [email protected]
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