[Exim] smtp auth

Hi,

I want to do smtp auth with real usernames and passwords. How can I look
up and check the user in the password/shadow file? I compiled exim with
pam support, I think I have to do it with pam but how? I didn't find
anything in spec.txt.

thx, Gabor

ps.: exim 3.10, debian 2.2

-- 
 corax@??? : ggabor@??? > http://www.sopron.hu/~ggabor/
     pgp public key available: finger ggabor@??? to get it.