Sorting flat mail into delivery point sequencing

A according to number of sort mail method and system. The method mail end of the first sort a providing is suitable for sending to the first sort module, and is suitable to ways of the mail end of the second sort the second sort assembly. The mail corresponding to the first sort module; said assembly identification mail, and a on the first sort on the sort assembly, sorts the mail. A mail of the first sort module is sorted, corresponding to the second sort module; A on the second sort on the sort module, according to the conveying order's sort depth, sorts the mail.