Setting up DNSBL in Postfix

[staufj22]

Hi All,

I'm trying to setup RBL+ from Trend Micro. Here's what I need to add in the postfix config file.

rbl_reply_maps = hash:/$config_directory/rbl_reply
smtpd_recipient_restrictions = permit_mynetworks,
reject_rbl_client activationcode.r.mail-abuse.com,
reject_rbl_client activationcode.q.mail-abuse.com,
reject_unauth_destination

I know that I can use the instructions here to add the smtpd_recipient_restrictions line, but what about the rbl_reply_maps?
Can I just add it in main.cf or is there another place to add it so that it dosn't get over written?