This site has been developed as a volunteer management system and dynamic web application to be used specifically for 12 step Hospital and Institution purposes.
You can let twilio email api handle this whole service. They can store contacts who sign up for email messaging via button on homepage. We can then email blast these contacts just like we do with mail chimp. Let the button direct the user to the signup form just like mail chimp does.
Access settings for email twilio product via the twilio console.