dovecot - Apr 2004 - configuring dovecot for NIS (w/ pam)

Hi,

I am trying to start using dovecot on a linux machine.
I config it to auth w/ my passwd/shadow and it worked perefectly.

I'm not getting to config it to work with my SUN NIS (not +)

As I understood I must use PAM for this, I tried to config it w/o any 
success...
do someone has a config file/ pam config for this ?

thanks

--Yedidia