Spam Reports are triggered when a recipient marks one of your emails as spam. Spam reports can only be gathered from Internet Service Providers (ISPs) that provide a feedback loop.
It is important that addresses that have marked your messages as spam be permanently removed from your send list, even if the recipients have previously opted into receiving your messages. Continuing to send to customers who have reported your email as spam can severely affect your deliverability rating.
You can also access your Spam Reports from the Suppressions settings menu in the Twilio SendGrid App.
For more information, please see our Spam Reports documentation.