Restricting mail use: local/internet

[Randy Edwards <redwards@golgotha.net>]

I'm running Exim as my MTA and I've got a situation where I would like
to restrict e-mail usage for some users to the local machine, but still
allow other users to have full internet e-mail capabilities.  These
users are all accessing the Linux box from Win95 machines via Samba.

Could anyone give me some clues as how I can accomplish this?  Thanks in
advance.

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