There's a new version of the HubSpot API

We're also working on a new documentation website, you're invited to check it out and give us your feedback.

How Does HubSpot validate email addresses?

HubSpot will validate the email address used for any process that would create or update a contact record.  This includes using the Contacts API to create or update a contact directly, and also the processing of any form submissions or events. Learn more about how HubSpot validates email addresses.