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Syntax of PTR Record for External Domain

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Hello All......My domain is listed in the blacklisted domains.  Following is the message.

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.

I am only guessing that I need to create PTR Record for my domain which BTW does not exist.  I would appreciate if someone could guide me as to how I can create this in my external domain by example like IP Part and Name Part. 

Thanks in advance. 


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