Every time a custom webhook is triggered, Integromat will validate the email output from that webhook using MailboxValidator. If the email is verified, it will create or update a contact in Hubspot CRM with the output data of the webhook. It will then move that contact to a specific list depending on the status of the email address.
This is a predefined template that will make the creation of your scenario much easier. Of course, you can always expand and customize the scenario to meet your own individual needs.