Masao Garcia:
> Wietse,
>
> Okay, I think I know what the problem is. Our reply-to addresses are for a
> domain that's not handled (yet) by our mail servers. We are in the middle
> of a transition to bringing our e-mail in-house away from an external
> pop/imap provider but during the transition we'd still like to keep the
> reply-to domain name the same (we just have forwards set up on our external
> provider to point to our temporary e-mail addresses). From looking at the
> logs, the bounce is going to our provider's MX server and stops there. If I
> change my reply-to to a domain that is handled by my relay then I get the
> bounce message back.
> So I guess my question is now, will I have to wait until I change the MX
> record to point to my relay before the bounce messages come in or is there a
> way to set up something on my external provider's side to forward the
> bounces to my relay? From my limited understanding of how e-mail servers
> work, I'm thinking I'll have to wait until I change the MX info, right?
DNS records have a "time to live" (TTL) attribute, which specifies
how long a remote DNS server may use the information.
When you change DNS for your mail domain, it will take at least
one TTL before all the old DNS information has expired.
Therefore, both the old AND new mail server must handle mail for
your domain for at least one TTL.
Wietse
