| There are many reasons why you should make sure that that your own server has the correct MX record and set up for reverse DNS lookup.
First of all let’s briefly explain what reverse DNS is used for it used to determine which IP address is associated with a hostname.
A reverse DNS lookup is used for the opposite, to determine which hostname is associated with your IP address. Sometimes reverse DNS lookups are required for diagnostic purposes.
Today, reverse DNS lookups (or reverse mapping) are used more frequently for security purposes to trace a hacker or spammer. Many modern mailing systems use reverse mapping to provide simple authentication using dual lookup: hostname-to-address and address-to-hostname
Reverse DNS can come in quite handy, if you have an e-mail broadcast platform or you’re sending out of lots of e-mails and you want to ensure that all your e-mails of getting delivered to your client’s inboxes, reverse DNS is the solution.
What you’re actually doing is authenticating yourself as a sender. For example if I was to send 500 e-mails to domain names Hotmail.com or Hotmail.co.uk there is a possibility after sending 100 e-mails Hotmail might block you from sending to that domain for a short period of time. The reason for this is you will appear to be a spammer.
With reverse DNS lookups Hotmail would check you’re MX record and the reverse DNS ultimately this would authenticate yourself as a valid sender massively reducing the risk of being blocked by Hotmail.com. This also coincides with other e-mail providers Yahoo and Bing and so on.
You can also use reverse DNS lookups for validating data, for example if you wanted to validate 4000 e-mail addresses you could quite simply create a basic script that would ping the host providers. Your reverse DNS setup will ensure you don’t get blocked by the provider throughout the validation process.
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