RE: about the A and PTR for sending mail
-Original Message- From: bind-users-bounces+msk=cloudmark@lists.isc.org [mailto:bind-users-bounces+msk=cloudmark@lists.isc.org] On Behalf Of Mark Andrews Sent: Wednesday, November 09, 2011 7:06 PM To: 风河 Cc: bind-us...@isc.org Subject: Re: about the A and PTR for sending mail While there is no RFC requirement that they match is there any reason not to make them match (the above records don't match) given that is the intent of the IN-ADDR.ARPA namespace? Ideally I would agree, but there are some passable operational reasons for this to happen, and there are also some good operational ones as we enter IPv6-land. Instead, I agree with another poster who suggested a mismatch or absence of this data in the DNS is good input to a scoring system, but not good grounds for outright rejection. -MSK ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
Re: about the A and PTR for sending mail
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 74.117.233.4 mail.dnsbed.com.300 IN A 74.117.232.204 The corresponding PTR records are: 4.233.117.74.in-addr.arpa. 36466 IN PTR dnsbed.com. 204.232.117.74.in-addr.arpa. 36453 IN PTR dnsbed.com. The forward lookup for dnsbed.com returns:; 173.245.61.41 173.245.61.115 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 - 74.117.233.4 - dnsbed.com - 74.117.233.4 would be a consistent reverse/forward loop. mail.dnsbed.com - 74.117.233.4 - dnsbed.com - 173.245.61.41 is not Maybe the easiest way would be to change the PTRs of 4.233.117.74.in-addr.arpa. and 204.232.117.74.in-addr.arpa to mail.dnsbed.com, so you don't have to move the A records of dnsbed.com HTH, Hauke. signature.asc Description: OpenPGP digital signature ___ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
