[Dovecot] Dovecot as a POP3-/POP3SSL-proxy in front of exchange 2003

Dear all,

im looking for a solution to protect an Exchange 2003 email server from direct "pop3-internet-connects".

Is it possible that Dovecot act as a POP3-/POP3SSL-Proxy, "LDAP-authenticate" all user logins to a Windows 2003 domain controller and forward then all POP3-connects to a single Exchange 2003 server?

Could someone give me some advices or a link for howtos for this solution?

The howto on www.dovcot.org (http://wiki.dovecot.org/HowTo/ImapProxy) does not fit in my situation because it prefere a mysql server and not a LDAP-server/domain-controller.

Greetings

Paul

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