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.
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:
mail.yourdomain.com-- or --gateway.yourdomain.com
If it is 'generic_addressing_style.upstream_provider.com' 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.