[Dovecot] Is it possible to authenticate against Active Direcotry using the whole e-mail?

Hi all!

Is it possible to authenticate against Active Directory, using the whole e-mail address and not the user part (%n), so that if you support mutiple domains, all users should authenticate with their e-mail addresses.

I use auth_bind_userdn = DOMAIN \ %u but somehow the *mail* attribute of Active/LDAP should be employed.

thanks in advance Dimitrios Karapiperis