ProcMail and Spamassassin

We just upgraded from GPL to Pro. I see that in order to allow VM handle Spamassassin and ClamAV ProcMail has to be changed. I'm not a Linux pro (yet anyway) but is it as simple as remove this line:

"Feed to program /usr/bin/spamassassin"

from ProMail and then checking the Spam Filtering and Virus Filtering boxes in VM ->System Settings->Features and Plugins

What about this line in ProcMail:

"Write to maildir $HOME/Maildir/.spam"

Should I leave or remove it?

Any advice is appreciated, -Roger