You can use DMARC (Domain-based Message Authentication, Reporting and Conformance) with HubSpot. The domain's DMARC policy should have SPF and DKIM both set to "relaxed" alignment, and you'll want to take the following steps:
DMARC is used to tell your recipients' email servers how to use existing authentication methods like SPF or DKIM to verify the owner of the domain. All HubSpot customers are on HubSpot's shared email servers hosted on hubspot.com, so mail won't be in alignment with your own domain's policy by default.
Please note: if you're seeing DMARC authentication errors, check out troubleshooting steps for common issues.
If you purchase a Dedicated IP, our Deliverability Team will configure it to be compatible with your DMARC specifications.