Postgrey
From Linuxintro
Postgrey is greyListing software for the postfix MTA.
How to get it
Download postgrey from http://postgrey.schweikert.ch/
How to set it up
- Extract your postgrey package
- Copy postgrey_whitelist_clients to /etc/postfix/
- Copy postgrey_whitelist_recipients to /etc/postfix/
- Add a user named postgrey:
useradd -m postgrey
- start postgrey
./postgrey --inet 127.0.0.1:60000
- make sure postgrey is listening on port 60000:
$ nmap localhost -p59998-60002 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2007-08-10 07:44 CEST Interesting ports on lvps87-230-12-146.dedicated.hosteurope.de (127.0.0.1): PORT STATE SERVICE 59998/tcp closed unknown 59999/tcp closed unknown 60000/tcp open unknown 60001/tcp closed unknown 60002/tcp closed unknown Nmap finished: 1 IP address (1 host up) scanned in 0.049 seconds
- Make sure there is a line like this in /etc/postfix/main.cf:
smtpd_recipient_restrictions = permit_mynetworks,
permit_sasl_authenticated,
reject_unauth_destination,
check_policy_service inet:127.0.0.1:60000
- restart postfix
/etc/init.d/postfix restart
Check if it is running
To check if postgrey is running you can use this command:
# ps -A | grep postgrey 1020 pts/1 00:00:00 postgrey
To check if it listens on port 60000 you can use this command:
# nmap localhost -p59998-60002 Starting Nmap 4.11 ( http://www.insecure.org/nmap/ ) at 2007-08-10 07:44 CEST Interesting ports on lvps87-230-12-146.dedicated.hosteurope.de (127.0.0.1): PORT STATE SERVICE 59998/tcp closed unknown 59999/tcp closed unknown 60000/tcp open unknown 60001/tcp closed unknown 60002/tcp closed unknown Nmap finished: 1 IP address (1 host up) scanned in 0.049 seconds
See also
http://www.debuntu.org/postfix-and-postgrey-a-proactive-approach-to-spam-filtering
