[exim] about the ldapauth Expansion conditions

       I want build a mail system with exim4,Windows Active Directory
Server, and a pop3 or imap server software.
now,exim4+windows ADS is ok.the SMTP AUTH I use ldapauth,I found it's very
useful in our structure.so I want
find a pop3 or imap server that also support a auth mechanisms like the
ldapauth .
       have some pop3 or imap server support ? please help me!