[Exim] Exim + Cyrus IMAPD + Cyrus SASL

Does anyone know of a COMPLETE exim + cyrus imapd + sasl howto anywhere?

I've followed the exim + cyrus imapd stuff I have found but it seems to be
trying to check local users and i get 'unrouteable address' in my log and
'user unkown' in the bounced email.

Can someone point me in the right direction or offer some advice?

Cheers,
John