From: Wietse Venema (wietseporcupine.org)
Date: Wed Jun 03 2009 - 18:07:21 CDT

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Rob Tanner:
> Hi,
>
> We have some email policies that we want to implement and it looks like a
> policy server is the perfect tool. We have two edge servers on which we
> want to implement the policies. My thought is to build a threaded server in
> Java and run it actually one the machine that the databases it will consult
> are already running. My question is what happens if for any reason the
> policy server hangs, crashes, etc, and stops accepting connections. Does
> Postfix also hang and stop processing mail or does Postfix simply timeout
> and is the timeout length a settable parameter in main.cf?

Postfix detects connection timeout or connection failure and tries
to reconnect a few times. It then sends a 4xx reply to the client
so that the client can try again later.

The default setting is:

smtpd_policy_service_timeout = 100s

You'll want to use a robust policy server (like, one that is
restarted) and a monitor that checks if it is still responsive.

        Wietse

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