SMTP Open Relay Test

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.

Also, you might be interested in taking a look at our services section (eg managed anti-spam solutions) or our appliances section (machines built specifically to stop spam).