You can train the Bayesian database for an alias email address of which you are a member.
Similarly to how you would train the per-user Bayesian database for a non-alias email address, forward samples of spam and legitimate email to the Bayesian control email addresses. However, instead of forwarding from your own email address, use the alias email address as the sender ("From") email address.
For example, user1@example.com might be a member of the alias group1@example.com, and receive some spam that was sent to that alias. To train the per-user Bayesian database for the alias, User 1 would forward the spam to learn-is-spam@example.com using the sender email address group1@example.com.
