When you send an email, the recipient can report the email as spam. When this happens, Mailgun and SendGrid can report it back to Rock through their APIs. Rock will then find the person and inactivate their email address in the system and add a note to their record. The note indicates that the email address was deactivated due to a spam complaint and includes the date of the complaint.

In order for this to happen, in Mailgun you would need to set up a webhook of type Spam Complaints. In SendGrid you'll want to update the Event Webhook to include "Spam Reports" under Engagement Data.

Check out the Unsubscribing section of the Configuring Email chapter above to see how Rock can help your emails avoid being reported as spam.