> 1. Setup with the blocklist sbl.spamhaus.org

edit a courier configuration file called "esmtpd" and set this one:
BLACKLISTS="-block=zen.spamhaus.org,BLOCK"

> 2. Allow complete relaying privileges to all clients NOT on the blocklist

this is not a good idea. If your MTA is exposed to the internet you'll get
blacklisted in 10 minutes all over the world due to the fact that you are
an open relay. This is also not good for internet.

> 3. Require authentication of clients on the blocklist, but allow them
> complete relaying privileges after successful authentication.

you can setup relaying privileges without authentication using the smtp
client ip address, but I'm not sure if courier will let your mail going on
if the client ip address is dns blacklisted, nor it's a good idea at all

Please think twice before setting up a mail server this way if it is going
to play in internet!
Ciao, Dino.


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



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