[Exim] Relaying from non-local hosts

Hi,

I'm sure this is something that should be easy to do, but buggered if I can
figure out how to do it (it's Friday here - that's my excuse and
I'm sticking to it).

We currently have a setup where exim relays mail for hosts local to our
domain, and denies anyone else. We are increasingly finding that users with
home connections are wanting to be able to send mail from our server, but
exim is restricting the relaying from outside.

The problem is that the users are coming in on dynamically assigned IP
addresses from various ISPS. We need to allow relaying from any host (eek i
hear you say) but only if they authenticate with a valid username and
password [preferably from the /etc/hosts file].

Any suggestions as to how to go about this would be greatly appreciated


--
Martin Smith
Network Administrator
CAMBIA
Phone: (02) 6246 4515
Fax: (02) 6246 4501
Mobile: 0402 482 873