[Exim] [soleil] Restricting senders to an alias

I have a system alias which I wouldn't like anyone to send e-mail to. I've searched the FAQ
but I cannot see a director (??) that would help me do something like that.
I'd like to speficy a flat file which exim will check to find the users allowed to post to that alias
address. Maybe it's something someone has already done before?

Thanks.

-Wash

--
Odhiambo Washington
Wananchi Online Ltd.,
wash@??? 1st Flr Loita Hse.
Tel: 254 2 313985 Loita Street.,
Fax: 254 2 313922 PO Box 10286,00100-NAIROBI,KE.

Until you value yourself, you won't value your time. Until you value your
time, you will not do anything with it.
-M Scott Peck