formMule sends targeted, personalized emails from a Google Sheet. Run as either a manual email merge or -- more powerfully -- as a triggered merge that runs automatically on form submit or on a timer.
A great way to use formMule is when you are gathering responses in a Google Form, and later on, you want to email everyone who signed up using your form. Create a spreadsheet from the responses. Make sure to collect their email addresses!
For more instructions, including a video tutorial please refer to Mail Merging using formMule.