[exim] Trimming out unnecessary users.

Hi,
I have been following the instructions in the Debian Bible and have now
managed to set up my Mail server nased on Exim4 and CourierIMAP. There
is an instruction in the book to use the script to convert the Linux
user database into an EXIM4 UDB. This seems a security risk because it
converts all the system users to mail users too.

Anyway, I have trimmed out the unnecessary usernames.

Anyone got any comments?

Cheers,

Rob.