How do I get fallbackhosts to work?

The NMS 4.15 tuning guide says that service.smtp.smtp-router.fallbackhosts became available in Patch1, but when I set the variable and restart SMTP, I can't get it to work. Has any worked with this before?
[220 byte] By [708377] at [2007-11-25 7:14:20]
# 1
Please set the configutil parameter as ./configutil -o service.smtp.smtp-deliver.fallbackhosts -v <IP ADDRESS OF FALLBACK HOST> OR<HOSTNAME>I hope this works out for you.
708574 at 2007-6-29 17:49:04 > top of Java-index,E-Mail, Calendar, & Collaboration,Sun Java System Messaging Server...
# 2
Please set the configutil parameter as ./configutil -o service.smtp.smtp-deliver.fallbackhosts -v <IP ADDRESS OF FALLBACK HOST> OR<HOSTNAME>I hope this works out for you.
708574 at 2007-6-29 17:49:04 > top of Java-index,E-Mail, Calendar, & Collaboration,Sun Java System Messaging Server...