What is Reverse DNS for email applications? (71/285 technotes for 2015)

If you plan to send email from one of the instances

• Provision and EIP for the instance.
  
• Request to remove email sending limitations with the EIPs.
• AWS works with ISPs and Internet Spamming Organization - Spamhaus to reduce the email sent be flagged as spam

What is DNS? (57 of 295 technotes for 2015)

Domain Name Servers (DNS) are the Internet’s equivalent of a phone book. They maintain a directory of domain names and translate them to Internet Protocol (IP) addresses. This is necessary because, although domain names are easy for people to remember, computers or machines, access websites based on IP addresses.

References:

http://bit.ly/1zUXdrv