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- Maybe in reply to: Alon Friedman: "spam filtering appliance - prevent an infinite loop"
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From: mouss (no email)
Date: Mon Apr 02 2007 - 05:05:11 EDT
Alon Friedman wrote:
> I have an appliance that I use for spam and virus filtering. It is set
> up as MX.
> All the mail from all the hosts on my network has to go to the
> appliance before delivery. The problem is how to set up the mail
> server.
> email that is sent directly to the mail server does not go through the
> appliance so the email is not scanned. I would like to set up postfix
> to relay all incoming messages to the appliance except email that is
> coming from the appliance (to prevent an infinite loop). How do I do
> it?
use multiple smtpd listeners. the smtpd on port 25 forwards email to the
appliance (content_filter for instance) and the appliance sends back
filtered mail to port 10025. this is an example. you can also play with
IPs instead of ports if the appliance can't be configured to use a
different port.
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