Exim and changing the outgoing FROM: domain

[Alec Smith <alec@shadowstar.net>]

I've just installed Exim on a Potato system, and would like to have 
outgoing mail appear to be from user@shadowstar.net regardless of the 
machine's actual domain. Under Sendmail I could do this with the 
MASQUERADE_AS function. Is there a similar method to do this on Exim, and 
if so how is it set up?

Alec