Update Guest User’s Email Address (Update)
When you create an Experience Cloud or Salesforce site, Salesforce
automatically creates a guest site user. In any site created before the Summer ’21 release,
the email address for the site guest user record was that of the Salesforce user who created
the site. After the Summer ’21 release, the system generates a dummy email address to use in
the guest site user record.
Where: This change applies to Aura, LWR, and Visualforce sites accessed through Lightning Experience and Salesforce Classic in Enterprise, Performance, Unlimited, and Developer editions.
How: For sites created before the Summer ’21 release, check the guest site user record for each site to ensure that the email used can be exposed publicly. The email address used for creating the guest site user record doesn’t have a functional purpose, other than creating the record. Use an email address that isn't sensitive to public exposure.
Check the Release Updates in your org for more details on how to change your sites’ guest user record email addresses.

