With an IMAP account, if "Store sent messages on the server" is checked does Mail only store mail on the server?

With an IMAP account, if "Store sent messages on the server" is checked (in Mailbox behaviors) does Mail only store sent mail on the server?
So should it not be checked if you want Mail to store sent mail on the server and the computer?
Thank you.
iHope

Hi Norm G,
Thanks for your comments and the link to further information.
With it checked you will get both on the server and the Mac.
I have it checked, yet when I pause the curser over Sent mailbox the tooltip says "Contents stored on server. Name on server: Sent Messages". Does this mean stored only on the server or also on the server?
What does your tooltip say?
At the moment sent emails only appear in that Sent mailbox. If Mail also stores them on the Mac should they also appear in another Sent folder "On My Mac"?
Thanks for your help.
iHope

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