Multiple users requested stronger anti-spam rules, maybe because they shared their email on their website and now are partially fucked up.
Spamassassin allows a way to learn SPAM and ham, if you provide enough spam and enough ham. Actually the process is manual and requires some time.
A script to provide SPAM and ham from the personal directory would be amaxing, to be run after an user is sure to have marker as SPAM all the SPAM, and to do not have ham in the SPAM.
Also, we can just parse the incoming emails from dummy email addresses like email@example.com.