Real-Time Open Relay Detection
Ensure your mail server isn't leaking spam. We execute an active, zero-authentication routing test to verify if your server incorrectly accepts external payloads, providing the exact raw SMTP transcript to secure your infrastructure against global blacklisting.
An Open Relay is a critical misconfiguration that allows anyone on the internet to send SPAM through your mail server. Enter your server IP or hostname, and we will attempt to relay a fake message to an external domain without authenticating.
An Open Relay is the fastest way to get your server IP blacklisted globally. Spammers constantly scan the internet looking for misconfigured servers to abuse.
RCPT TO command to request a relay action. If it returns 250 OK, you are vulnerable.Your feedback has been submitted successfully. We appreciate your help in improving our tools.