[Dovecot] ldap auth (with user and domain a different places)

Hi,

I am trying to use dovecot with my virtual-hosting setup. I have all users in LDAP like uid=user,dc=domain.tld,o=myorganization for the user with the mail-address user@domain.tld. This is also the username that user should use for login, but it is nowhere in the ldap-db in this form together, just user and domain at their own places. Is it possible to authenticate with dovecot against such an ldap-directory?

After reading docs and comments in the config-file, I think no, but I am not sure. As I read the source, it is not possible just now, but would be, if I could use %d in the searchbase.

Or did I understand something wrong?

TIA

Timo Boettcher