First, you can't run multiple postscreen daemons with the same postscreen_cache_map setting, as that will corrupt the database. I'm adding a check for this.
Second, to make postscreen listen on more than once address, list
all addresses in main.cf:
inet_interfaces = 1.2.3.4 1.2.3.5 127.0.0.1
Or perhaps easier:
inet_interfaces = all
which is the default.
Wietse
