http://www.rfc-editor.org/rfc/rfc5465.txt
RFC 5465: The IMAP NOTIFY Extension, A. Gulbrandsen, C. King, A. Melnikov2009-02-01T23:00:00-00:00This document defines an IMAP extension that allows a client to request specific kinds of unsolicited notifications for specified mailboxes, such as messages being added to or deleted from such mailboxes. [STANDARDS-TRACK]