Jay Lee wrote:

[snip] 
>      What I'd like to do is configure a transparent SMTP 
> proxy on port 25
> of the firewall that send the outgoing message through ClamAV,
> allowing only clean messages to pass.  User's wouldn't notice
> anything when they send out messages via port 25 but viruses would
> not get out (and admin notification of the offending IP wouldn't be
> hard either).  Is anyone aware of a SMTP proxy that is capable of
> this?  I believe the transparent proxy part would be configurable
> with Linux and IPTables.  Any suggestions?

Besides clamsmtpd there is DspamPD
http://caspian.dotconf.net/menu/Software/DspamPD/ and also ASSP
http://assp.sourceforge.net/

Beware that using clamsmtpd/dspampd alone will probably make your mail
server an open relay.  The problem is that that the server will see all
connections as coming from itself (in fact from 127.0.0.1) because these
proxies are only semi-transparent.  As you mention, this can be solved by
using Linux's firewall settings and clamsmtpd has some documentation on how
to do it.

Regards.
-- 
Ren� Berber

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