RATS-Dyna - Probable PC or home connection infected with a Trojan, Bot, or Emailer Program -- If you are listed in the Spamrats/RATS-Dyna blacklist and you operate your own mail server, you likely have no valid PTR-Record. If you are simply a home email user, you have a dynamic IP address and may need to contact your ISP for assistance. If you operate a domain name and are using your ISP for SMTP-Authentication, try contacting your DNS Provider to use their SMTP-Services instead.