[Dovecot] Active Directory authentication

Hello all

I would like to ask if there is adequate mechanism to authenticate users through POP3 against Active Directory by Outlook Express so that users will authenticate seamlessly using logon credentials.

I have implemented LDAP authentication but users must supply their credentials to Outlook Express although they have logged on to Windows (AD).

the ntlm auth in Dovecot 1.1 (windind) satisies this requirement (no credentials in Outlook)?

thanks Dimitrios