Configure authentication for your email sending domain
To fully authenticate your email sending domain, you can navigate to your domain settings in HubSpot:
- In your HubSpot account, click the settings settings icon in the top navigation bar.
- In the left sidebar menu, navigate to Content > Domains & URLs.
- In the top right, click Connect a domain.
- In the dialog box, select Email Sending, then click Connect.
More here: Manage your email authentication in HubSpot