On 18.4.2012, at 14.36, John Robinson wrote:

I'd like to change the on-disk layout for my mboxes from being ~/mail/foo/bar to ~/mail/foo.bar so that I can have folders containing both messages and subfolders, without having subfolders beginning with . and then having to do all the other fiddling with locations of index files etc. that goes along with LAYOUT=maildir++, and also leaving the filesystem layout looking sensible so my users see their mailboxes instead of the index and control files.

Is this possible or do I need to patch something?

Not possible without patching. There's also the other possibility of doing something like:

Trick mbox configuration which allows a mail folder which contains both

messages and sub-folders

mail_location = mbox:~/mail/mailboxes:DIRNAME=mBoX-MeSsAgEs:INDEX=~/mail/index:CONTROL=~/mail/control

from http://wiki2.dovecot.org/MboxChildFolders