To prevent visits from a domain not hosted on HubSpot from showing up under the Referrals bucket in the Sources Report:
- Navigate to Reports > Reports Settings> Domains.
- Enter any domains that are a part of your site (but are not hosted on HubSpot or part of your main domain) in the Site Domains section.
- Verify that the box is checked to enable Automatic cross-domain linking.
- Click Save.
HubSpot attaches parameters to your links from one domain to another (__hsfp, __hssc, and __hstc) to track visitors as they travel between your domains. Moving forward, traffic between these domains will be considered as part of your website and will not appear in the Sources Report under Referrals.
Note: Existing Referral data will not be removed retroactively.