I'm using ldap database at backend and I want to configure my mail server such a way that one mail id i.e. info@domain.au will be stored as dbox format while other mails will be stored in maildir format. I've already referred to dovecot's official site but it's too complicated for me.      Please help me on this. 
How to configure dbox mail storage format for a single mail account?
email;postfix;webserver;ldap;dovecot