Delimiters and Prefixes

A simple folder name is Friends.

Most email servers allow you to put folders inside other folders.

On most email servers, the parts of a folder's name are separated with a / character. So you might have People/Friends.

On the other hand, some email servers use a ., giving People.Friends.

Some email servers keep most email in a parent folder, often INBOX, so the above folder would be INBOX/People/Friends.

The migrate and mirror commands provide options to help "translate" between the behaviour of the source and destination servers.