The Suppression List step unsubscribes an email address so they no longer receive workflow emails from your organization. Once unsubscribed, the Send Email step will automatically skip that address in future workflow runs. Use this step to programmatically manage your unsubscribe list as part of a workflow.

• Trigger an unsubscribe based on some other action
• Conditionally unsubscribe contacts based on upstream logic (e.g. unresponsive after multiple follow-ups)
• Unsubscribe contacts as part of a cleanup workflow that processes and filters a contact list

The step takes a single email address as input and adds it to your organization's unsubscribe list. If the address is already unsubscribed, the step still succeeds and indicates it was already on the list. The output includes a success field and an already_suppressed field. This step does not count as a premium action.