unpacking spam attachments for sa-learn

[Jeff Portwine]

I'm trying to write or find a script that will extract attachments from an email message and write them to a directory, where I could run sa-learn on them.     Right now, mail comes in through exim and our users get their mail via pop3.    I have got them all forwarding the spam they get to a spam email account as attachments so that all the headers will be kept intact.   I thought extracting those attachments would be fairly trivial to do but i'm having some problems with it.   I can't seem to find a script that actually suits my needs... and when I tried to write my own I found that I really don't know how attachments work all that well.   It doesn't seem like it should be that difficult but it's still giving me problems.     Does anybody know of a good script to use for this purpose or have any pointers on how I could write a script that accomplishes this?   Thanks, Jeff