[Wylug-help] Using Exim as a controlled relayer

[Gary Stainburn]

I've managed to get the Exim + Pgsql setup working.

For the domains I'm hosting I have a set of records which contain an email 
address within the domain and an delivery email address, e.g.

user at hosted.domain ->		gary.stainburn at ringways.co.uk

When I test this using 

exim -bt user at hosted.domain

it works fine, but when I try to send an email it fails 

relay not permitted.

Obviously i do not want to turn on relaying, so how can I configure Exim to 
allow emails that have matched a record in the user table to be forwarded?