How can the email notification content change?
Any email template available
You need to log in in RC online admin portal as admin to get the email notification tab.
Then you need to go to
More > Account Settings > Appearance :
Email Notifications
Check the below reference
https://community.ringcentral.com/questions/27363/template-of-email-notification.html
Already have an account? Login
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.
Sorry, we're still checking this file's contents to make sure it's safe to download. Please try again in a few minutes.
Sorry, our virus scanner detected that this file isn't safe to download.