How to configure using multiple DNS Blacklist sites

I have DNSBL working for one site but I would like to use more than one. What is the syntax of that entry?

Subject: How to configure using multiple DNS Blacklist sites

Separate them with a semicolon:

sbl.spamhaus.org; bl.spamcop.net; list.dsbl.org; blackholes.mail-abuse.org; relays.ordb.org