Describe the main features of the Indian postal network.
Main features of the Indian postal network are as given below : The Indian postal network is the largest network in the world. Types of mail: There are two types of mail : First-class mail: Cards and envelops fall in this category. Second-class mail : It includes book packets, registered newspapers and periodicals. Mail channels : For quick delivery of mails, six channels have been introduced. These are – Rajdhani Channel, Metro Channel, Green Channel, Business Channel, Bulk Mail Channel and Periodical Channel.