adds special use and xlist
This adds productivity for IMAP clients, such as MS Outlook, so that it identifies these folders as special folders for Sent, Junk, Trash and Drafts. cPanel default settings are to allow IMAP SPECIAL-USE and XLIST. Quota plugin is now enabled for debian6 doveadm commands, for example:
doveadm quota recalc -u postmaster@example.com