Sdbgrey is a greylisting policy server for Postfix. It is based on greylist.pl from the postfix distribution. It requires mysql and libsdb with mysql support.

The database parameters are set at the top of the script in the variable database_url. To use the default settings, type in mysql:

create database greylist;
grant all privileges on greylist.* to 'postfix'@'localhost' identified by 'postfix';
use greylist;
create table greylist (
greykey varchar(255) unique not null,
greyvalue integer not null default 0);

To run this from /etc/postfix/master.cf:

policy unix - n n - - spawn
user=nobody argv=/usr/libexec/postfix/sdbgrey

To use this from Postfix SMTPD, use in /etc/postfix/main.cf:

smtpd_recipient_restrictions =
...
reject_unauth_destination
check_policy_service unix:private/policy
...

Requirements:

· MySQL
· Simple database library