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From: Chuck Swiger <cswiger@mac.com>
Date: Tue, 6 Feb 2007 16:41:05 -0500
To: usleepless@gmail.com
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Cc: freebsd-questions@freebsd.org
Subject: Re: sendmail setup
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On Feb 6, 2007, at 4:35 PM, usleepless@gmail.com wrote:
[ ... ]
> i ran tcpdump on the external interface, and the only thing that seems
> to happen is my machine contacting the other machines, but they never
> reply!:

Typically that means your ISP is filtering outbound connections to  
port 25.  If you've got a friendly mailhost handy, try relaying via  
the RFC-2476 MSP port, 587/tcp, instead of 25/tcp...

Otherwise, contact your ISP's tech support and have them fix their  
broken mail relays.

-- 
-Chuck