Over the years we have been happy to provide our Free Blacklist Lookup Tool among our other Free Tools and we appreciate all of your feedback and suggestions. We have gone through our current database and have removed these RBLs due to either them being shutdown or faulty results:

SPAMBAG
DNSBLNETAUOHPS
DNSBLNETAUOMRS
DNSBLNETAUOSPS
DNSBLNETAUOSRS
DNSBLNETAUOWFS
DNSBLNETAUOWPS
DNSBLNETAURDTS
DNSBLNETAURICN
DNSBLNETAURMST
DNSBLNETAUT1

MxToolBox is not affiliated with any Blacklists, we just provide a public tool that can be utilized to see if you are on a Blacklist. If you are on a Blacklist, rest assured as we do offer Blacklist Protection! For more information please feel free to visit our website or email us at info@mxtoolbox.com.

We’re always looking for new Blacklists to add, so if you want to suggest one to us, please send an email to support@mxtoolbox.com.

For information about other Blacklists that have shut down or Blacklists that are having problems, view this forum post.