Can one 'unignore' headers from a specific host

[Chris Green]

I want to unignore headers from a few specific hosts, i.e. I want to
do something like:-

    unignore Received: from dns.zbmc.eu

Is this possible in any way?

Alternatively is there any way to flag messages which have "Received:
from dns.zbmc.eu" in the headers and add a custom header or some other
way of indicating that they're from dns.zbmc.eu?

I need a way to distinguish messages from a number of different
systems on my LAN - dns.zbmc.eu, backup.zbmc,eu, t470.zbmc.eu where
the from address is just root at zbmc.eu.

I guess I could route them to different mailboxes but I was hoping for
something displayed in the message somehow.

-- 
Chris Green