Just go ahead and use the recommendation from Paul's blog. He's a reliable resource. :-)
I check that box as a matter of course when I do a new installation of Exchange. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kennedy, Jim Sent: Thursday, November 5, 2015 9:17 AM To: [email protected] Subject: [Exchange] DNS ErrorRetry Exchange 2010 on 2008 R2, current on SP's and rollups. There is no edge server in the mix, just one hub and two mx. Having an issue with sub domain email addresses. [email protected] DNS is failing, then they time out. SMTP,mail.bw.edu,-,Messages: 0 Bytes: 0 (The DNS query for 'DnsConnectorDelivery':'mail.bw.edu':'b24305cc-5873-4c34-b6fa-1d65ffcd8482' failed with error : ErrorRetry) First time I have ever seen this, and so far it only appears to be this one domain but I am not certain of that yet. Looks a lot like the below links, but I am hesitant to start changing things for one problem I have never had before. IPV6 is currently enabled, but not being used. http://exchangeserverpro.com/messages-queuing-error-451-4-4-0-dns-query-failed/ https://social.technet.microsoft.com/Forums/en-US/a9b1a718-7b22-4678-aa91-c8ecebb4c6fa/edge-transport-server-fails-dns-query-when-emailing-to-one-specific-domain?forum=exchangesvrsecuremessaginglegacy Send connector is set to use the NIC. NSLookups from the hub server. > set type=mx > mail.bw.edu Server: mydnsserver.my.domain Address: 10.55.236.100 Non-authoritative answer: mail.bw.edu MX preference = 15, mail exchanger = 974909182.mail.exchangelabs.com 974909182.mail.exchangelabs.com internet address = 207.46.163.215 974909182.mail.exchangelabs.com internet address = 207.46.163.170 974909182.mail.exchangelabs.com internet address = 207.46.163.138
