Fondness for email feature (10)

I believe the answer is:

attachment

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'fondness' is the definition.
(I know that attachment is a type of fondness)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for attachment that I've seen before include "Fond regard" , "Document with e-mail" , "what might accompany 50 [EMAIL]" , "Affection" , "Means of securing" .)

I've seen this clue in the Sydney Morning Herald.

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