"emails" in the noun sense
1. electronic mail, e-mail, email
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
"you cannot send packages by electronic mail"
"emails" in the verb sense
1. e-mail, email, netmail
communicate electronically on the computer
"she e-mailed me the good news"
Source: WordNet® (An amazing lexical database of English)
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