The Email action allows you to quickly and easily send emails from the Task/status page.
Click on the Forms & Actions tab to configure the status page. This will display a blank box with an Available Actions bar on the right-hand side.
Drag and drop the Email action from the Available Actions into the blank box.
In the Visible to box you can add users who you want to be able to view the Compose Email box. Internal Users can see the content by default.
Under Visibility Rules you can hide the Compose Email box until question(s) from forms are answered by clicking the Add Question button and adding a question.
You can add more than one question and also add a specific answer, so the box will only show after the specified answer is inputted.