From Memory Alpha, the free Star Trek reference.
E-mail is an electronic message exchange protocol (Electronic-Mail) used on 20th and 21st century Earth. With the advent of computing technology and the development of huge international, corporate, private, public and military networks in the late 20th century, E-mail became a fast, free and effective means of conveying information around the planet.
In 1996 Rain Robinson used e-mail to tell a friend at JPL about her contact with the USS Voyager. (VOY: "Future's End")
In 2000, Shannon O'Donnell suggested using email to spread the word of Henry Janeway's campaign to save downtown Indiana from the development of the Millennium Gate. (VOY: "11:59")
In 2024, Vin ironically told Gabriel Bell to "check his E-Mail" as he, in Vin's opinion, was a loser just as Biddle Coleridge was. (DS9: "Past Tense, Part II")
