Here are the steps you need to take to set up email notifications for changes made to a specific project task in SharePoint:

1. Log into your Sharepoint account and select the site that contains the project list.
2. Select the List Settings option from the settings menu.
3. Click the Incoming e-mail settings option from the list of settings options.
4. Check the box that says Enable incoming e-mail.
5. Enter the appropriate group email address in the Group Email Address field.
6. Enter the Email display name, and description that you would like to have appear when emails come from this list.
7. Select the Delivery via SMTP option and enter the appropriate SMTP settings for your server.
8. Select the Save option to save your settings.