bley is an intelligent greylisting daemon for Postfix (and Exim).

It uses various test (incl. RBL and SPF) to decide whether a sender should be greylisted or not, thus mostly eliminating the usual greylisting delay while still filtering most of the spam.

bley is written in Python using the Twisted framework. It uses pyspf for SPF validation and publicsuffix for checking of domains against the PublicSuffix.org database. Database interaction is implemented via sqlite3 for SQLite, psycopg2 for PostgreSQL and MySQL-Python for MySQL.

Unpack the tarball (or clone the git tree), adjust bley.conf.template, rename it to bley.conf and run ./bley.

Unpack the tarball (or clone the git tree), run python setup.py build followed by python setup.py install, copy /etc/bley/bley.conf.template to /etc/bley/bley.conf, adjust it to your needs (see CONFIGURATION below) and run /usr/bin/bley.

Basically you just have to configure the database:

dbtype = pgsql for PostgreSQL, mysql for MySQL or sqlite3 for SQLite
dbhost = the host where the database runs on (usually localhost)
dbuser = the name of the database user
dbpass = the password of the database user
dbname = the name (or path in case of SQLite) of the database