[Gllug] Rejecting mail at backup MX

Jack Bertram jack at jbertram.net
Tue Feb 10 13:39:38 UTC 2004

* Bruce Richardson <itsbruce at uklinux.net> [040210 13:32]:
> Right.  Well, if your backup MX were running Exim, you could use its
> "call forward" feature where it can (if so configured) check the
> recipients on incoming mail with the end system that it will eventually
> deliver the mail to and reject the recipient if the end system does so.
> It does this for each recipient as they are given in the course of the
> smtp conversation, so no NDRs are generated by your system.  If the end
> system can't be contacted then it can optionally defer or accept the
> recipient.


> I haven't used Postfix for anything serious in some time (come to think
> of it, I replaced the last Postfix set-up a few weeks ago), so I don't
> know if it has a similar feature.  I'd be interested to know if it does.
> If not, your practical alternatives are LDAP lookups (which you said you
> don't want) or synchronising user maps between the two boxes.

I don't know of one, but I might get in touch with the mailing list
and find out - it sounds very useful.

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