I've just reaslised a serious flaw in my plan. The problem is that the 1st 2 digits of the number are a divisional code, and must remain the same, only the tail end of the number can be incremented +1. E.G. 74991 should roll to 741000, rather then 75001.
IBM Notes offer Encryption feature using which the user can secure its NSF emails or entire database easily. In this section we will discuss about the process to Encrypt Incoming and Outgoing Mails in depth.