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Re: Question about Qmail relating to MX retry processing

To: qmail@list.cr.yp.to
Subject: Re: Question about Qmail relating to MX retry processing
From: Marc Perkel <marc@perkel.com>
Date: Sat, 25 Nov 2006 10:15:23 -0800
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References: <45679726.9080600@perkel.com> <20061125041044.GA19046@discworld.dyndns.org> <00a901c71063$d76b7920$7e00a8c0@pawel> <20061125.105613.226722930.hanche@math.ntnu.no> <20061125165751.GA26193@odin.dempsky.org>
User-agent: Thunderbird 1.5.0.8 (Windows/20061025)
Email routing in front emd spam filtering.

       +-------------------------+
       |                         |
       ^                         V
 Internet >-----> Backup MX     Primary MX >-----> Customer's Email Server
                         V                          ^
                         |                          |
                         +--------------------------+


The idea here being that an overloaded Primary MX would return 4xx errors 
causing mail
to route through the Backup MX servers. Thus a 4xx for the Primary doesn't meant
that the backup will return 4xx.





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