[Mimedefang] Training Spamassassin

[Paul Crittenden]

I am using mimedefang, spamassassin and clamav to filter my email. Once it is filtered it then send to an Exchange server so no email stays on the filtering server. I have enabled bayes and auto learning but a lot  of spam is not being caught. On my old server I can get a file of spam and then use it to train spamassassin using sa-learn. Since the email doesn't stay on the filtering server how can I do that now?
 
Paul Crittenden
Computer Systems Manager
Simpson College
Phone: 515-961-1680
Email: paul.crittenden at simpson.edu