MxToolBox provides free email blacklist lookups and monitoring (RBL or DNSBLs)as a free service to the public.  We do not endorse any of these blacklists or even recommend them as reliable information to block spam and viruses in inbound emails.

However, many email administrators do choose to use these lists to block emails.  We make as many lists as possible available on our lookup tool to provide as much information as possible to those that are listed and, subsequently, rejected.  We leave the interpretation of the results up to the professional opinion of the user. 

The LBL list recently went offline, returning positive results for any lookup. MxToolBox will remove this list from our tool at 5:00pm Central Time on 1/25/2007.  The reason for the delay is that in our professional opinion, the result is still valid.

It is still valid because email is still being rejected by some servers because of this listing, and that is what our tool is intended to help diagnose.  Not all servers specify the reason that an email was rejected, so not all bounce messages may be useful in pointing to the source of the problem. 

Anyone using LBL to reject inbound email should obviously stop using it immediately.  This would also be an excellent time to review ALL lists you are using to reject emails.  If you don’t specifically know what a list represents and believe in the quality of the information, you should remove those lists as well.

Anyone listed on LBL (this is YOU, because EVERYONE is listed), should not worry.  You only need to take action if you have emails blocked.  In that case, you should contact the system administrator of the receiving email server and point them in the right direction.