nanog mailing list archives
Re: mail does bounce (was: Customers down?)
From: Christian Kuhtz <ck () arch bellsouth net>
Date: Sat, 1 Jan 2000 18:28:04 -0500
On Sat, Jan 01, 2000 at 03:07:43PM -0500, Steve Sobol wrote:
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.
I beg to differ.
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.
Yep.
I think I like it better that way. Just because both nameservers are temporarily down doesn't mean the domain doesn't exist. :P
Or, worse, there's a glitch in the root servers or the registry maintaining the authoritative data. Or everything's fine on that side and the mail server receiving the message has been temporarily disconnect from the 'global truth'. Better to queue temporarily and treat it as a transient failure than to drop. That's almost always the best approach for loosely coupled systems, IMHO. Cheers, Chris -- Christian Kuhtz Architecture, BellSouth.net <ck () arch bellsouth net> -wk, <ck () gnu org> -hm Atlanta, GA "Speaking for myself only."
Current thread:
- Re: Customers down? jlewis (Dec 31)
- <Possible follow-ups>
- Re: Customers down? Joe Shaw (Dec 31)
- Re: Customers down? Sean Donelan (Jan 01)
- Re: Customers down? Mikael Abrahamsson (Jan 01)
- mail does bounce (was: Customers down?) Greg A. Woods (Jan 01)
- Re: mail does bounce (was: Customers down?) Steve Sobol (Jan 01)
- Re: mail does bounce (was: Customers down?) sthaug (Jan 01)
- RE: mail does bounce (was: Customers down?) Roeland M.J. Meyer (Jan 01)
- Re: mail does bounce (was: Customers down?) Steven J. Sobol (Jan 01)
- Re: mail does bounce (was: Customers down?) Greg A. Woods (Jan 02)
- Re: Customers down? Mikael Abrahamsson (Jan 01)
- Re: mail does bounce (was: Customers down?) Christian Kuhtz (Jan 01)