The SEPARATOR should just refer to the storage structure and the PREFIX should refer to the hierarchy. So if you use "/" as your SEPARATOR, then your storage structure will be user-directory/folder/sub-folder and if you use "." as your storage structure (the default), then your storage structure will be user-directory/.folder.sub-folder . A PREFIX of INBOX. should cause all of the folders & sub-folders to appear under the inbox; a PREFIX of "." should cause all of the folders to appear at the top level; and a PREFIX of Mail. will should all of the folders to appear under Mail with the exception of the INBOX.
Thx for your long post! ^_^ I understood that it was something like .<prefix><separator>folder1<separator>folder2 But, from my tests, it seems not to work as expected... At least not with thunderbird. By default, Tbird has "allow server to override namespaces" prefix=INBOX. and separator=. => no prefix and Trash system not working. prefix= and separator=. => INBOX. prefix (from tbird) and Trash system working. '/' in prefix and separator seems to be ignored (converted to '.'). I guess I will leave it to prefix= and separator=. but one user who uses apple mail complained about some prefix problems...
Thx, JD