[exim] overall rate limiting?

Hi people,

I was wondering if anybody has a solution to our problem.

We have mail gateways, they take all incoming email,
do virus scanning, spam tagging, greylisting, etc.

After that, email is passed to UNIX machines running
exim for routing. Recently, spam has been coming in in
big bunches and some internal email arrives that way
as well. It would be nice to set up the
routing machines so that they process a fixed number of
email messages per second. This would avoid large load spikes
on our mail stores as mail floods in.

Any ideas or suggestions?

Regards,
pdg

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