Network Tools Open Relay Test
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SMTP Open Relay TestThis is a SMTP open relay test script which is able to optionally report open relays to DSBL (Distributed Server Boycott List). Should you discover any bugs or problems, kindly let us know. Please do NOT abuse the system.
Frequently Asked Questions
What is an open relay?
Why is an open relay bad?
A number of organisations are cracking down on spam originating from open relay servers by forming blacklists. Several anti-spam solutions check if the mailserver is in one of these blacklists before allowing incoming mail from it. If your mail server gets listed on one of these blacklists, a lot of the emails that you would be sending would not be reaching their destination.
What software blocks spam from open relays?
If you are interested in finding software to block spam, you can browse our software section or alternatively take a look at our customizable server-based anti-spam software feature comparison; you can check out the ones listed which have public blacklist support here or else tweak the settings yourself here.
How do I close my open relay?
Where can I get more technical info on the Simple Mail Transfer Protocol (SMTP)?
For more info on what damage an open relay can do to your business, check out this article: "Is your email server an open relay?"
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