NOTE: This method only works for POP account, not IMAP account

At the Thunderbird, go to Tools > Account Settings . If Tools menu does not appear, press the Alt button on your keyboard.

Click on Server Settings on the account that you want to leave a copy of mail

Under Server Settings , check on "Leave messages on server"



Then click on the OK button.

NOTE: If you would like to remove the mail after several days, you can check on " For at most ? days "
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