As his invention celebrates its 20th anniversary, Nathaniel Borenstein explains how and why he changed the future of technology.

This article titled “Father of the email attachment” was written by Patrick Kingsley, for The Guardian on Monday 26th March 2012 19.00 UTC

Twenty years ago this month, 100 American web geeks opened their inbox to find a bizarre email. Inside the message were two attachments. The first was a photograph of the Telephone Chords, an a capella quartet comprising four hirsute IT researchers. The second: the Chords' recording of an old barbershop favourite, Let Me Call You Sweetheart.

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