Lightning Experience doesn’t display an option to send an email when you assign a task. It also doesn’t display a setting to receive an email when someone assigns you a task. However, if you switch from Lightning Experience to Salesforce Classic, one of these options can be available. It depends on how your admin has set up your Salesforce org. If one of these options is available, you can receive emails for tasks that you assign to yourself or created with a status of Completed.
Ask your Salesforce admin for details.
|Available in Lightning Experience in: Developer, Enterprise, Group, Performance, Professional, and Unlimited Editions|