Open Relay Test
What is an open relay?
An open relay is a smtp server configured in such a way that is allows a third party to relay (send / receive email messages that are neither from nor for local users). Therefore, such servers are usually targets for spam senders.

How to test if your mail server is open relay
Enter the IP address of your mail server and click the "Test" button below to see if it is an open relay.
 
Please enter IP number of the target host:

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Open Relay Test
Test if your mail server is an open relay for spammers.
Blacklist Checker
Check if your IP is listed in DNS based email blacklists (DNSBL)