[exim] Private Aliaes

I have a customer asking me to set up a separate alias file, but one that
can only be used when the email comes from a local(trusted) machine.



Is there a way in the router to say "only look at this router if the email
came from these hosts?"





Thanks in advance, and if this is in the FAQ or manuals, accept my apologies
in advance. I looked around for over an hour and didn't see anyting.



Terry