[MM3-users] User suspended after too much spam

I have set up spamassassin as spamfilter, and it works reasonable so far. Some spam passes the filter and I try to use it for training. However, one of my users has a very restrictive spam filter and rejects all spam. This causes mailman to suspend that user. I have to enable the user each time.

How can I change that behaviour? I do not want my users to be suspended.

Cheers