consider instead running spamd on one machine (a firewall) in front of
your mailservers.

Nothing says spamd must be run on a mail server.

Jyri Hovila wrote:
> Hello, world!
>
> I was searching the archives in hope of finding a solution to problems
> which arise from running spamd on a SMTP server pool. I found an old
> thread (http://www.monkey.org/openbsd/archive/tech/0410/ msg00238.html)
> which discusses the same problem from the opposite point of view.
>
> First of all, I vote for Bob Beck's suggestion of adding (optional)
> masks to the whitelist entries (see the original thread). Secondly, I
> would like to bring up another variant of the problem.
>
> I run a three-node SMTP server pool. Incoming traffic is shared between
> the servers using a round-robin DNS configuration. As you can guess,
> greylisting and load balancing do not work together too well: the
> all-important delivery retries often go to a different server than the
> original delivery attempt.
>
> The situation is even worse if there happens to be a SMTP server pool
> at the remote end too.
>
> I would like to suggest a synchronizing daemon, which would be able to
> synchronize the spamd database across several hosts. I would be happy
> to contribute it myself, but my programming skills just aren't good
> enough for this task.
>
> Comments, anyone?
>
> Yours,
>
> Jyri
>
>
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