Step 1: Open the “Preferences” window.
i) Using the menu bar at the top of the screen, click Mail, then Preferences. The preferences window will appear.
Step 2: Choose the “Account Information” screen.
i) Click Accounts (the blue “@” sign) along the top of the window if necessary.
ii) Click the address@example.com account in the left “Accounts” column if necessary.
iii) Click Account Information if necessary.
Step 3: Disable "Remove copy from server".
i) Uncheck Remove copy from server after retrieving message.
Step 4: Close the "Preferences" window and save the changes.
i) Click the red close button in the upper-left corner of the "Preferences" window and the "Save Changes" dialog pops up, choose Save option.
