The new Features in SpamAssassin 3.0

With earlier versions of SpamAssassin, maintaining per-user configuration was difficult in virtual hosting environments when users did not have shell accounts on the mail server. SA 3 greatly eases this difficulty by allowing per-user preferences, Bayesian data, and auto-whitelists to be stored in an SQL database, rather than in files in users' home directories. Example SQL tables are included for both MySQL and PostgreSQL servers. Alternatively, per-user preferences can be stored in an LDAP database, which is a boon to sites that have LDAP-driven mail setups.