How to email in the folder called "on my Mac"?

I recently discovered that the emails were placed in "on my Mac" in the "sent" folder. I suspect that it was not sent but placed there. I've never known the purpose of this folder and wonder if that's his goal. I have here a number of emails. Can someone tell me the function of this file?

An example is free up the storage space on the server account, by storing them in mail, on my Mac, makes it available for research, but maintains "away" from the main squares.

Emeils should not end up there if a user moved there, or has a rule to do it automatically.

Tags: Mac OS & System Software

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