I wrote a little bash script right after I got amavisd+spamassassin
running on the system here so I could forward email and have it learned
as either spam or ham. I'm the only one that uses it though, I don't
trust users on the system here to be able to differentiate between true
spam and ham.
Ryan:
Learning from forwarding mail is less than ideal. You will need to make
sure that your users are forwarding the emails as attachments, then you
will need to decode the attachment and learn that.
Dedicated shared IMAP folders are generally mentioned as a good
alternative. Search the archiv