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Feedback loop servers
Every time when the Spam button is pressed by one of your subscribers, the email provider the subscriber belongs to, will send a notification related to that event. In order to receive such notifications, you should subscribe for such notifications at the email provider.
However, most email providers will also send the notifications at one of these 3 addresses: abuse@domain.com, postmaster@domain.com and fbl@domain.com.
In order for MailWizz to process these notifications, you need to add feedback loop servers for each email address, either for the one you subscribed at the email provider, or for the 3 listed above.
Please note that when sending only via delivery servers of type web api you don’t need to setup feedback loop servers since these are automatically processed via webhooks.