Thanks, I think it is working now. 
I added :
pass in log quick on pppoe0 proto tcp from any to any port = 25 flags S keep state keep frags
to ipf.conf and I can receive mails now. 
Thanks again..

Mine

----- Original Message ----- 
From: "Manuel Bouyer" <bouyer@antioche.eu.org>
To: "Mine Sakiyama" <msakiyam@yahoo.com>
Cc: <netbsd-help@netbsd.org>
Sent: Thursday, May 22, 2003 12:32 PM
Subject: Re: NetBSD ipfilter firewall.


> On Thu, May 22, 2003 at 10:31:51AM -0700, Mine Sakiyama wrote:
> > [...]
> > 
> > May 22 08:17:13 alex ipmon[82]: 08:17:13.316211 pppoe0 @0:33 b mail.netbsd.org[155.53.1.253] ->
> > internet.internal.com[192.168.0.2] PR tcp len 20 (164) frag 144@1336 IN (entire session log
> > below).
> 
> Maybe add 'keep frags' in addition to keep state
> 
> -- 
> Manuel Bouyer <bouyer@antioche.eu.org>
>      NetBSD: 24 ans d'experience feront toujours la difference
> --
>