Computer message (1-4)

I think it could be either:

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1-4

e-mail

'computer message' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for e-mail that I've seen before include "Digital message" , "Electronic missive" , "Messages via the internet" , "Electronic message" , "Messages between computer terminals" .)

I've seen this clue in The Mirror.

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