Ok, this isn't difficult.
In Evolution, select the "Edit" menu - "Edit Preferences"
It will display a box with "Mail Accounts" as the first entry. If you have more than one account, click on the one you want to change. Then click "edit".
On the third tab "receiving options" you can select to leave a copy of the mail on the server and if you want to have them deleted after a period of your choice.
John
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