Zen mail
n. An incoming email message without any body text or attachments.
Zen Mail — A mysteriously blank e-mail which arrives without any body copy and no attachments.
—Jane Simon, “Fun People: My Word!,” The Sunday People, May 26, 2002
1996 (earliest)
Zen Mail — Email messages that arrive with no text in the message body.
—Gareth Branwyn, “Jargon Watch,” Wired, October 01, 1996
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