docker compose -f /opt/mailcow-dockerized/docker-compose.yml exec postfix-mailcow postsuper -d ALL
Delete every message from the Postfix queue
postsuper -d ALL purges the entire mail queue including messages waiting on retry timers. This permanently drops mail that has not been delivered yet, so export the queue first if any of it matters. Prefer deleting individual IDs with postsuper -d QID.
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