Greylisting and mailer pools revisited

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02-18-2008, 08:00 AM

Jyri Hovila

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Greylisting and mailer pools revisited

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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Greylisting and mailer pools revisited