From mboxrd@z Thu Jan  1 00:00:00 1970
From: Samuel Jean <sj-netfilter@cookinglinux.org>
Subject: Re: mails not coming thru'
Date: Sun, 05 Dec 2004 09:04:40 -0500
Message-ID: <41B31578.6050106@cookinglinux.org>
References: <f02e560404120501483864a165@mail.gmail.com>
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To: Varun Pabrai <varunsaa@gmail.com>, netfilter@lists.netfilter.org

Varun Pabrai wrote:

>Then I added rules using packet filtering for 
>sending and recieving mails as follows :
>
>accept if network protocol is TCP and destination port is 110
>  
>
add: accept if network protocol is TCP and source port is 110

>accept if network protocol is TCP and destination port is 25
>  
>
add: accept if network protocol is TCP and source port is 25

>saved and applied configuration and rebooted.
>
>But I am not able to send or recieve mails on client 
>machines. Why ?
>  
>
What happens is (I guess) your mailserver receives the packet, but when
answering, it gets dropped because the source port is now 25.

Same thing for your POP server.

>Anybody has any idea please help.
>  
>
HTH,

Samuel