Using email storage in single folders makes it hard to train DSPAM. Sending email to the email@example.com alias works, but a more user-friendly system is needed. Additionally, since Mozilla Mail (Thunderbird) does a good job with 'Junk', it would be useful to process all user files for 'Junk' in their home directories. This small program grabs the DSPAM signatures of each email in the files provided and feeds them to DSPAM.
Avelsieve is a Squirrelmail plugin for creating Sieve scripts on a Sieve-compliant (RFC 5228) mail server. Sieve is a mail filtering language intended for server-side filtering of email messages. Avelsieve provides a user-friendly interface for adding and manipulating mail filtering rules.