about the A and PTR for sending mail
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 18.104.22.168
> mail.dnsbed.com. 300 IN A 22.214.171.124
> The corresponding PTR records are:
> 126.96.36.199.in-addr.arpa. 36466 IN PTR dnsbed.com.
> 188.8.131.52.in-addr.arpa. 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 -> 184.108.40.206 -> dnsbed.com -> 220.127.116.11 would be a
consistent reverse/forward loop.
mail.dnsbed.com -> 18.104.22.168 -> dnsbed.com -> 22.214.171.124 is not
Maybe the easiest way would be to change the PTRs of
126.96.36.199.in-addr.arpa. and 188.8.131.52.in-addr.arpa to
"mail.dnsbed.com", so you don't have to move the A records of dnsbed.com
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