[Samba] Question about implementing samba4 cleartext passwords

[Adrian Stoica]

Hello

I want to create a domain using samba4 and from there to authenticate 
users against ad. The challange for me is that i have never worked out 
with domain or with ldap , and that i need to use AD users/passwords to 
authenticate not only the domain clients , but the mail users and 
perhaps the ftp, or web users , that are on another linux distro's.

It is possible to implement a AD with samba4, and to retrieve user and 
password from that database for use on ex. dovecot ? How ?

Many thanks,
Adrian Stoica