"to:" field

I'm running procmail 3.10 on linux 1.2.1 and I have the following problem:
when I receive messages with cc: field, all domains of addresses are 
changed to the domain of my machine. The same thing happens when I 
receive messages from listservers; for example, messages coming from 
procmail(_at_)informatik(_dot_)rwth-aachen(_dot_)de have the to: field like 
this:
procmail(_at_)felix(_dot_)unife(_dot_)it
Any suggestion? 


Fabio Coatti
Sysop di Hobbit's BBS
2:332/414.0 Fidonet
39-532-207852/208996