Well i fixed my problem...I retried to use the authpam module, and then i checked out my /etc/pam.d/imap conf courier-imap seems to not take care of debian users : ) since the file uses the 'pam_pwdb.so' module which is no longer used by debian
i needed to replace it with the correct 'pam_unix.so'
hope it will help someone... !DSPAM:47abb3d3310548422592328!
