Hey all, I've been using the ispconfig main server for several clients in the beginning, though only for mailbox storage. Web and the other services are hosted elsewhere. I recently started to get more customers, and created an new slave server just for mailbox storage and configured the master server to have a proxy in front. That way customers always only use my defined mail domain for all mailboxes. the proxy than forwards the authentication + mailbox request to the correct backend. With this I would like to move my old mailboxes (and users) to the newer mailbox server, and downgrade my main server to cut in the costs. Is there an easy way to do this?