spamc/spamd .. diff versions, diff systems

[Tuc at T-B-O-H.NET]

Hi,

        We are in the middle of a migration of users from a
system which we can't upgrade running 3.1.8, to a new system
(which can of course be upgraded) running 3.2.4 . 

        I'm contemplating having the .procmailrc of users
on the old system call spamc with the hostname of the system
running 3.2.4 (After I start the daemon listening on its IP
instead of 127.0.0.1 only). 

        Would there be any issues doing this? Is there a way
I can libwrap the port instead of firewalling it? 

                Thanks, Tuc