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MacMail "Mailboxes": if move message to two mai...

If I move a message (for example size 500KB) to two mailboxes (I experience the "mailboxes"

as folders) then is that taken up twice the space (1000KB in this example) in Mail app, or

since it is the same message (in two places) is the amount of space used not multipled, and

in this example, only 500KB no matter how many different mailboxes the item in moved to?

Thank you for your time and consideration.

最後更新：2017-09-13 02:32:46