What is Reverse DNS?

Reverse DNS (rDNS) is name resolution that looks up an IP addresses to obtain a domain name, performing the opposite function of the DNS server, which turns domain names into IP addresses.

Reverse DNS can be used as a spam filter. Typically, spammers use invalid IP addresses, that is, ones that do not match domain names. A reverse DNS program looks up the IP address of an incoming message and, if no valid domain name is found, the server blocks the message. Although reverse DNS is fairly effective for filtering spam, it also often blocks valid emails.

Our administrators configure reverse DNS on all of our email servers. If you administrate your own server, you can contact your IP address's provider to configure reverse DNS.

Note: Do not use a PTR record to configure reverse DNS in our system.


이 글이 도움되었나요?
피드백을 보내주셔서 감사합니다. 고객 서비스 담당자에게 문의하시려면 지원 전화 번호 또는 위의 채팅 옵션을 이용하시기 바랍니다.
도와드릴 수 있어 기쁩니다! 더 도와 드릴 것이 있나요?
그것 유감스럽습니다. 혼동이 되었던 사항 또는 솔루션이 고객님의 문제를 해결하지 못했던 원인을 알려주세요.