Mail n. : A spot.

Mail n. : A small piece of money; especially, an English silver half-penny of the time of Henry V.

Mail n. : Rent; tribute.

Mail n. : A flexible fabric made of metal rings interlinked. It was used especially for defensive armor.

Mail n. : Hence generally, armor, or any defensive covering.

Mail n. : A contrivance of interlinked rings, for rubbing off the loose hemp on lines and white cordage.

Mail n. : Any hard protective covering of an animal, as the scales and plates of reptiles, shell of a lobster, etc.

Mail v. t. : To arm with mail.

Mail v. t. : To pinion.

Mail n. : A bag; a wallet.

Mail n. : The bag or bags with the letters, papers, papers, or other matter contained therein, conveyed under public authority from one post office to another; the whole system of appliances used by government in the conveyance and delivery of mail matter.

Mail n. : That which comes in the mail; letters, etc., received through the post office.

Mail n. : A trunk, box, or bag, in which clothing, etc., may be carried.

Mail v. t. : To deliver into the custody of the postoffice officials, or place in a government letter box, for transmission by mail; to post; as, to mail a letter.

Example:
How do you send Mail when you have a Mail slot in your door?

Taxonomy
free web-based email.

Defination from the web:
Mail provides free, customizable email, including PhotoMail online picture sharing, spam protection, filtering, and multiple email account management.