smtp auth

[Juan Calderon]

hi guys. just a question.

i've applied qmail-ldap-1.03-20000701.patch and it's working fine. i
also have pop3 and imap working (courier-imap 1.2.1). Now i need to use
SMTP AUTH so i can deal with roaming users. 
i've applied qmail-smtpd-auth-0.26, but i can't get it work. docs say
that i need checkpassword and cmd5checkpw, but they don't user ldap.
how can i make it work?  does anybody has something like this?

thanks in advance

juan