> We use courier mail server for a long time now but we miss one thing in
> our current setup and this is a spam filter on SMTP level (so that spam
> mails get instantly rejected instead of deleted or bounced).

Following the Unix principle, do one thing do it well, I decided to put a
full featured mail filtering gateway on top of my top clients' courier
installations and let courier doing MTA only.

I installed a VM with http://www.mailcleaner.org/ and pointed all MX
records to it.
Any email coming in is filtered (spamassassin, clamav, dkim, dmarc, spf,
grey listing, dnsbl, content filtering, TLS, razor, pyzor, dcc ...) before
reaching my courier mta installations.
Then, I configured courier to deliver any outgoing email to mailcleaner to
do outgoing filtering and DKIM signing.
To do this, put a single line like this on etc/esmtproutes:

: [192.168.0.62],25/SECURITY=NONE

192.168.0.62 is the private IP address of mailcleaner host.

I'm heaving the very best results with this architecture, and I also have
great flexibility, web configuration and some graphs as well!!

-- 
Dino Ciuffetti
Linux System Administrator and IT Architect
TuxWeb S.r.l. - http://www.tuxweb.it/



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