problems with secondary mail server

[Matus]

hi.

im using mailscanner and it work perfectly but ...
when - for some reason - email come first to the second mail server
and then is delivered to the primary one, spam is never detected ( im
detecting spam only by spam list of IP's ) so i assume that problem is
b/c sender of email is IP of my secondary mailserver and not blacklisted IP of
spammer. Is it any way to configure mailscanner preventing that ? i know
installing mailscanner on secondary mail server will help but i dont like
that soluttion.

thanks

mm

ps: sorry for my english ;-)