All of Elis James' content revolves around some post found online (5)

I believe the answer is:

'some post found online' is the definition.
(electronic post)

I don't understand how the remainder of the clue works.

(Other definitions for email that I've seen before include "Electronic message" , "Post" , "Spam perhaps" , "Messages between computer terminals" , "Electronic communication" .)

I've seen this clue in The Independent.

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