Customer.guru is an easy-to-setup tool for measuring customer satisfaction using Net Promoter Score.
You can find more information here.
How this Customer.guru + TrueMail integration works
1. Add new record to a Customer.guru account
2. Zapier sends the email to be verified with TrueMail
3. Zapier updates the existing Customer.guru record with TrueMail result code in a custom field
Schedules a new survey.