processing of mail considered spam

[Admin]

Hi there,

Some spam is getting past the spamassassin.  So I;d like to devise a 
scheme where I manually place the emails not caught by spamassass in my 
'spam-mail' folder.  Is there any way to get spamassassin to process the 
contents of the folder so I those accepted messages are considered spam 
in the future?

Cheers,
Noah