[CentOS] using new sysconfig file

I installed postgrey from rpmforge and wanted to use sysconfig to change options instead of overwriting the init file. However, I get a weird warning from postgrey. I'm not sure if this is a postgrey quirk or I use sysconfig the wrong way.

/etc/sysconfig/postgrey: OPTIONS="--unix=/var/spool/postfix/postgrey/socket --delay=660"

/etc/rc.d/init.d/postgrey: OPTIONS="--unix=$SOCKET --delay=660"

# Source an auxiliary options file if we have one, and pick up OPTIONS, if [ -r /etc/sysconfig/$prog ]; then . /etc/sysconfig/$prog fi

Error: " invalid for option delay (number expected)

(The quote marks are necessary!)

Using the additional option directly in the init file works just fine.

Kai