`SUPPRESS` regulations add a user to your suppression list by the `userId`. Segment blocks suppressed users across all sources; messages you send to Segment with a suppressed `userId` are blocked at the API. These messages do not appear in the debugger, are not saved in archives and systems, and are not sent to any downstream server-side destinations. However, if you set up a destination in [device-mode](/docs/connections/destinations/#connection-modes), the events are sent directly to destinations as well. In this case, Suppression doesn't suppress the events.
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