Email Studio adds power tools to Gmail including Mail Merge, Email Scheduler for sending emails later, Auto Responder for sending smart auto-replies and Email Forwarder for auto-forwarding emails to another address.

Download: https://gsuite.google.com/marketplace/app/email_studio_for_g...

Source code: https://github.com/labnol/email-studio-gmail-addon

Video Tour: https://www.youtube.com/watch?v=I9-480xTEOc&list=PLIO7o3VwD0...