about the A and PTR for sending mail

Hauke Lampe lampe at hauke-lampe.de
Thu Nov 10 11:39:13 UTC 2011

On 10.11.2011 02:57, 风河 wrote:

> I have two server IPs, the A records for them are:
> mail.dnsbed.com.        300     IN      A
> mail.dnsbed.com.        300     IN      A
> The corresponding PTR records are:
> 36466 IN     PTR     dnsbed.com.
> 36453 IN   PTR     dnsbed.com.

The forward lookup for dnsbed.com returns:;

The reverse entries for your nameserver don't have to match your
mailserver name but they must be consistent, i.e. the reverse must
resolve forward to the IP address.

mail.dnsbed.com -> -> dnsbed.com -> would be a
consistent reverse/forward loop.

mail.dnsbed.com -> -> dnsbed.com -> is not

Maybe the easiest way would be to change the PTRs of and to
"mail.dnsbed.com", so you don't have to move the A records of dnsbed.com


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