List Description

RATS-Dyna is a collection of IP Addresses that have been found sending an abusive amount of connections, or trying too many invalid users at ISP and Telco's mail servers, and are also known to conform to a naming convention that is indicative of a home connection or dynamic address space.

List Specifications


Real mail servers would have a different reverse DNS entry, according to "Best Practices for ISP's and Network Operators". It should reflect the operator of the mail server. And if on top of that, they are sending out a flood of connections, you can probably bet that it is an infected PC, running a trojan or bot.

You should ONLY need to remove yourself from this list IF you are running your own mail server, "Best Practices" says that the reverse DNS that mail originates from, should resolve to the company that is responsible. For example:
-- or --

If it is '' it will probably get blocked by Anti-Spam technology anyways.

This represents approximately 50% of the most abusive forms of wasted overhead facing mail servers.

NOTE! Remember, you should ONLY use this if you are checking if it one of your customers (RELAY CLIENT SET)

NOTE! Do not use this at the global level unless you have some way of ensuring that it only affects inbound mail.

Download / Install

You should not need to 'install' anything. Just ensure that your RBL Lookup tool is set to point to ''.


Remember, you can ONLY remove your IP from this list, IF you have corrected your reverse DNS entry, which was one of the reasons you got on this list in the first place, to better conform to 'Best Practices'. Make sure that enough time has passed for DNS propagation.

Enter the IP Address you wish to remove:

Enter the characters you see in the image below: