[Dovecot] LDAP auth and multiple attributes to construct the mail path

Hello,

So I am trying to construct mail path for my LDAP user lookups, and i need to use two attributes instead of one.

For examle, my LDAP directory has two attributes: departmentAttr and userIDAttr, and I want the maildir to reside in /home/${departmentAttr}/${userIDAttr}

Unfortunately, I cannot seem to find a way to configure dovecot this way. Right now, I have something like

user_attrs = departmentAttr=mail=maildir:/home/%$/%u

But %u is the username (which in my environment can easily change, so I cannot use this for maildir location).

Any ideas on how to achieve that?

So far I have just one brute-force solution - to create an attribute MailDirAttr, and populate it with concatenation of departmentAttr+'/'+userIDAttr by means of a scheduled task. This sounds like unnecessary information duplication, which is usually a very bad practice.

So, again - any ideas?

Thank you, Anatoly.