Overview
Nether Relays is an open relay detection list operated by the Dutch Nether network. Similar in function to GWEEP Relays, it specifically flags SMTP servers that allow unauthorized mail relaying.
How It Works
Nether's detection system periodically tests SMTP servers for relay behavior. The specific test involves attempting to send email to external addresses through the target server β success indicates an open relay.
How to Get Delisted
After closing the open relay, visit relays.nether.net to submit a removal request. They'll re-test your server to confirm the issue is fixed.