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When you use Outgoing SMTP blocking in Antispam Administration, the RBL check does not work, possibly because it's not using the public IP of the sender.
- Add a RBL that lists your network's public IP address and assign it 50 points
- Enable outgoing SMTP blocking at 30 points
- Enable the quarantine if you want to
- When you send from behind your NAT router, mail gets delivered, not blocked or quarantined