Private IPs in Received Path email headers

[Andrew Miehs <andrew@2sheds.de>]

Dear List,

Up until now, I have not been striping received headers in my sent  
emails (The ones from work) so in the path you will see some internal  
IP addresses. Does any 'anti-spam' software check these headers, and  
try and do reverse lookups on them? Then marking them as SPAM as it  
can't look  up the original address?

I am using Postfix, and I could strip them with a 'header_checks',  
but I would rather not mess with the message headers if I can avoid  
it _messy_ ....

Comments?

Thanks

Andrew