;; ; delimits between two numbers inclusive.
;; ; Example: 2,4:7,9,12:* is 2,4,5,6,7,9,12,13,
;; ; 14,15 for a mailbox with 15 messages.
;; ; delimits between two numbers inclusive.
;; ; Example: 2,4:7,9,12:* is 2,4,5,6,7,9,12,13,
;; ; 14,15 for a mailbox with 15 messages.