mail

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mail:

see postal servicepostal service,
arrangements made by a government for the transmission of letters, packages, and periodicals, and for related services. Early courier systems for government use were organized in the Persian Empire under Cyrus, in the Roman Empire, and in medieval Europe.
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mail

Dispatches of correspondence and other objects tendered by and intended for delivery to postal administrations (ICAO).

mail

the hard protective shell of such animals as the turtle and lobster

mail

(messaging)
1. electronic mail.

2. The Berkeley Unix program for composing and reading electronic mail. It normally uses sendmail to handle delivery.

Unix manual page: mail(1)

mail

(1) Synonymous with email when dealing with computer applications.

(2) (Mail) The email clients in the Mac and Windows. Mail was the name of the Mac client before Microsoft adopted it for Windows 8. See Mac Mail and Windows Mail.