Here we can send same message to multiple person atasingle time by just running the script.
User has to give its mail id and password in the script itself and all the person's email id , name are to be stored in csv file so we can read them directly. For using the script one thing is needed we need to provide one permission to google for less secure apps the link is: https://myaccount.google.com/lesssecureapps?pli=1&rapt=AEjHL4NtSgvDAsbtL99pmXXjudTqaScTlGJJ1KU-tQAAIG7Gx3rxFKQE1hoUDEjjg20pmtfPYx8v4wQVQZAU40icvQq7XjXB8w
Here we can customise the message as per our requirement here I had taken example of hotstar that your premium subscription is activated like that we can customise our message.
Neel Shah