Hello,i'm going configure opendkim on my zimbra server for hotmail junk issue.

in order to make opendkim work on zimbra server properly i have to add these lines to /opt/zimbra/postfix/conf/main.cf file as described

smtpd_milters = inet:localhost:8891
non_smtpd_milters = inet:localhost:8891
milter_default_action = accept

but after postfix reload all changes going.Howto to make these records permanent?

zmcontrol -v
Release 7.1.3_GA_3346.RHEL5_64_20110928134520 CentOS5_64 FOSS edition.
opendkim-2.4.2-5.el5.x86_64