Hi list!

Finally I got the LDAP-Authentication work (it was a problem of the
OU-Path... :( ). Now I can authenticate the user against the AD and forwarding the
IMAP-Connection to the Exchange Server. Wow!

My next problem: we have TWO ADs and TWO Exchange-Servers. The first
AD has the users for the first Exchange, and the second AD for the
second Exchange.

I defined two files so:

auth-ldap-OLDAD.conf.ext:

passdb { driver = ldap args = /etc/dovecot/dovecot-ldap-OLDAD.conf.ext }

userdb { driver = ldap args = /etc/dovecot/dovecot-ldap-OLDAD.conf.ext

default_fields = imapc_user=%u imapc_password=%w imapc_ssl=imaps
imapc_host=sphinx.company.local imapc_port=993 driver=imap
uid=imapproxy gid=imapproxy home=/home/imapproxy }

auth-ldap-NEWAD.conf.ext:

passdb { driver = ldap args = /etc/dovecot/dovecot-ldap-NEWAD.conf.ext }

userdb { driver = ldap args = /etc/dovecot/dovecot-ldap-NEWAD.conf.ext

default_fields = imapc_user=%u imapc_password=%w imapc_ssl=imaps
imapc_host=exchange01.ad.company.org imapc_port=993 driver=imap
uid=imapproxy gid=imapproxy home=/home/imapproxy }

Well, the authentication works as expected, but when a user of the
second AD/Exchanges tries to log in, after a SUCCESSFULLY
authentication can't speak with the new Exchange server... :(

In the log of Dovecot I see:

Jun 23 15:07:58 proxy01 dovecot: imap(chorris): Error: User
initialization failed: Namespace '': Mailbox list driver imapc:
missing imapc_host Jun 23 15:07:58 proxy01 dovecot: imap(chorris): Error: Invalid user
settings. Refer to server log for more information.

Could someone explain me, why the configuration for imapc_host in the
second file are ignored?

Thanks Luca Bertoncello (lucabert@lucabert.de)