firewalled_smtp:driver = smtp port = 1234
firewalled_hosts:
driver = lookuphost transport = firewalled_smtp domains = foo1.my.com:foo2.my.com:foo3.my.com
firewalled_smtp:driver = smtp port = 1234
firewalled_hosts:
driver = lookuphost transport = firewalled_smtp domains = foo1.my.com:foo2.my.com:foo3.my.com