From owner-freebsd-questions@FreeBSD.ORG  Fri Jul  2 21:25:41 2010
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Date: Fri,  2 Jul 2010 23:25:58 +0200
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From: "Len Conrad" <lconrad@Go2France.com>
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Subject: Subject: pf:  pass in quick to port 25 still getting some blocks
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setting up pf on fbsd 7.2 for host security on a mail gateway.

the only rule for port 25 is:

pass in quick on em0 inet proto tcp from any to $ext_if port = smtp flags S/SA keep state

and then last rule:

block drop in log on em0 inet from any to $ext_if

while 1000s of connections to port 25 are getting through with the pass rule, several 100 connections are getting blocked with the default block rule, bypassing the pass rule.

I can't see how pf is selecting these connections to be blocked.

thanks
Len