How to understand the Email Status code in PI Office Mail

OFMA OMEMAIL table in PiOffiecaMail table contains a list of emails sent by the system.

The Email Send status ID is presented in numerical format which is not clear to indicate if the email is sent or not, below is a list of possible status IDs.
0   Unsent
1   Success
2   Cancelled
3   Failed
Environment Details
Product Feature: General
UPDATED:  November 22, 2017