Re: [Exim] pri/sec MX on same machine to catch spam

> > Am I correct in assuming that most mailservers (exim, sendmail, qmail,
> > smail, postfix, ...) will try the backup MX if the primary is down or
> > returns a temporary failure code?
>
> Exim certainly will, in both cases.

Ok. This can help the idea.

> What is more, if the primary is down and the message is sent to the
> secondary, if another message arrives very soon (before the time to
> retry the primary has arrived), Exim will go straight to the secondary.

I was basing the original idea on host ip alone. Then I thought about doing
it with host ip and sender. Given the fact that exim (and I assume others)
will use the secondary if the primary retry has not expired, using ip/sender
combinations won't be very useful.

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