Electronic post (1-4)

I believe the answer is:

e-mail

'electronic post' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for e-mail that I've seen before include "Means of communication" , "Electronic post" , "Send a message" , "Online correspondence" , "Online message" .)

I've seen this clue in The Telegraph and The Sun.

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