Reverse DNS

Glossary

Reverse DNS is the opposite. It takes the IP address and queries the DNS to see what friendly name that IP address is assigned to. 

While REVDNS records are not absolutely required, virtually all legitimate servers have them.  Theoretically, the only computers delivering mail to our network should be other legitimate mail servers.  Although many mail providers do not accept mail from servers lacking RDNS (or providing a suspicious RDNS entry), we do not.  We do, however, penalize such things in our weighting system.

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