How can spamassassin headers be filtered so that all or most of the spam messages go to a separate email file that can be checked for any false positives?

[Don Saklad <dsaklad@zurich.csail.mit.edu>]

For nonprogrammers maybe dyslexic, or maybe ADD, how can spamassassin
headers be filtered so that all or most of the spam messages, rather
than mixed in with email, all or most go to a separate email file that
can be checked for any false positives?... RMAIL in EMACS
and from time to time mutt are used for email

Single session
a. How can this kind of filtering be done
   during a single RMAIL in EMACS session?...

Existing commands
b. What emacs commands are already available
   for this kind of filtering?...