is lock needed when using spamd/c combo

[Obantec Support]

Hi

3.2.3 SA on FC3
just need to ensure i have the master .procmailrc syntax correct for spamc

i am using 

DROPPRIVS=yes
:0fw
* < 512000
| /usr/bin/spamc
:0:
* ^X-Spam-Status: Yes
$HOME/mail/spam

do i need to use the lock as per the procmail.example which uses

:0fw: spamassassin.lock
* < 512000
| spamassassin


Mark