Mail refers to materials such as letters and packages, handled in a postal system. Mail refers to the postal material for any specific organization. Mails are processed for distribution from post office at a particular time. Mail is a medium of transporting letters, packages and other postal materials. Mail refers to a vehicle by which mail is transported. Mail or messages can be sent electronically through e-mail. You just need to have an account on sites such as yahoo and the likes. E-mails are a very popular means of sending and receiving messages. Mail is also a term used to describe a protective covering that certain animals possess, like the shell of an animal.
Dennis Ritchie had once remarked, “At least for the people who send me mail about a new language that they're designing, the general advice is: do it to learn about how to write a compiler. Any editing, software work, and mail are done in this exported Plan 9.”
Mailing of letters and postal material requires the destination address to whom the mail is to be sent and the name of the sender is also mentioned in the mail.