Dear Jack,
This requires you to set the logic to send an email in your Save/Add microflow, for sure you need to have his email ,now if you want to restrict the action to a specific person you will have to assign the item to the person through an association between the Item and Account ‘Assigned To’ and on the list control the Edit feature based on this association for the current logged in user.
Update
To send an email, download and configure a module from the marketplace, then use an activity in your microflow to call send email.
Email Connector is a module that you can use, make sure to read its documentation.
Regards..