Merit Network
Can't find what you're looking for? Search the Mail Archives.
  About Merit   Services   Network   Resources & Support   Network Research   News   Events   Home

Discussion Communities: Merit Network Email List Archives

North American Network Operators Group

Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical

Re: mail does bounce (was: Customers down?)

  • From: sthaug
  • Date: Sat Jan 01 16:16:01 2000

> > 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,

Discussion Communities

About Merit | Services | Network | Resources & Support | Network Research
News | Events | Contact | Site Map | Merit Network Home

Merit Network, Inc.