Noun

mail (countable and uncountable; plural mails)

1. (uncountable) regular delivery of letters and small parcels, see also post
2. (not used in plural form) the organisation which operates such service (e.g. in Britain the Royal Mail)
3. (now rare) a single batch of mail picked up by such a service
   • 1823, The stranger in Liverpool; or, An historical and descriptive view of the town of Liverpool and its environs, Seventh Edition, T. Kaye, page 96,

     The following are the hours at which the letter-box of this office is closed for making up the several mails, and the hours at which each mail is despatched: ¶ […]

   • 1887, John Houston Merrill (editor), The American and English Encyclopædia of Law, Volume I, Edward Thompson, page 121,

     If he retains the account, and permits several mails to pass without objecting to it, he will be held to have admitted its correctness.

4. See mails.
5. (uncountable) electronic mail, e-mail: a computer network–based service for sending, storing, and forwarding electronic messages

Synonyms

• post (UK, Ireland, other dialects?)

Derived terms

• accountable mail
• air mail
• chain mail
• e-mail
• email
• electronic mail
• fan mail
• hate mail

• junk mail
• mailbag
• mail boat
• mail bomb
• mailbox
• mail carrier
• mail fraud

• mailman
• mailmerge
• mail order
• mail plane
• mail relay
• mailroom
• mail slot

• mail stop
• mail train
• mail truck
• snail mail
• voice mail
• vote-by-mail
• webmail

Mail, or post, is a method for transmitting information and tangible objects, wherein written documents, typically enclosed in envelopes and also small packages are delivered to destinations around the world. Anything sent through the postal system is called mail or post.

In principle, a postal service can be private or public. Governments often place restrictions on private postal delivery systems. Since the mid nineteenth century national postal systems have generally been established as government monopolies with a fee on the article prepaid. Proof of payment is often in the form of adhesive postage stamps, but postage meters are also used for bulk mailing.

Postal systems often have functions other than sending letters. In some countries, a Postal Telegraph and Telephone (PTT) service oversees the postal system as well as having authority over telephone and telegraph systems. Some countries' postal systems allow for savings accounts and handle applications for passports.