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To change your notification preferences, click on your name on the top right of the screen → Preferences → User account → Notification Preferences → Messaging.  Scroll down to the sections for Turnitin Assignment and Turnitin plagiarism plugin and uncheck the boxes to prevent emails being send whether you are on or offline.

Video instructions

<iframe src="https://swarthmore.hosted.panopto.com/Panopto/Pages/Embed.aspx?id=d72d893c-6412-45ce-96f8-a96601277ec7&autoplay=false&offerviewer=true&showtitle=true&showbrand=false&start=0&interactivity=all" height="405" width="720" style="border: 1px solid #464646;" allowfullscreen allow="autoplay"></iframe>  Removing Turnitin notifications