I recently added the FreeMail plugin, and although it appears to be
working, when I start SpamAssassin, I receive this message in my log:

Nov 11 06:45:48 spamd2 spamd[29934]: config: dup unknown type freemail_re, Regexp

I've put the FreeMail.pm in /etc/spamassassin, and created FreeMail.cf
as described, and it appears like it is working, as I am seeing some
messages get tagged with it.

Are the plugins that I am installing like this compilable regexps with
sa-compile? Or do they stand separately?