Email

'Email'

[electronic_mail.n.01] as in: (computer science) a system of world-wide electronic communication in which a computer user can compose a message at one terminal that can be regenerated at the recipient's terminal when the recipient logs in

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Examples:
you cannot send packages by electronic mail

'Email'

[e-mail.v.01] as in: communicate electronically on the computer

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Examples:
she e-mailed me the good news