Nintex automates core business processes in SharePoint with a few clicks, not code, so you can give more complex projects the time and attention they deserve.
You can find more information here.
How this Nintex + TrueMail integration works
1. Add new record to a Nintex account
2. Zapier sends the email to be verified with TrueMail
3. Zapier updates the existing Nintex record with TrueMail result code in a custom field
Starts a workflow