Hey everyone

Working with Slackware to implement a mail server in our corporate office. I just installed Qmail with all the goodies. My question is, is there anyway that i can make qmail look at our active directory server and see if the user exists, so i don't have to manaully enter all the usernames and passwords? Or furthermore, if i create an ldap server on my qmail server, is there anyway i can make Active Directory replicate on to that LDAP server as well?