Junk Mail list file

Does anyone have a quick way to make a procmail recipe where I can
keep an ascii text file with the from addresses of junk email, each
on a seperate line, and procmail will automatically reject any email
from any of the addresses in this list.  This way, I can just add new
addresses to the text file whenever I get a new junk email and I won't
have to modify my procmailrc file.

Forgive me if this is asked and answered often.