What I find puzzling is that check box didn't really change where I was looking up mx/dns...still via my internal servers. It only changed what was doing the lookup from the send connector doing it to the server nic. Assuming I understand this correctly.
So it seems there is a bug in the send connector system for look ups? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Michael B. Smith Sent: Thursday, November 5, 2015 12:35 PM To: [email protected] Subject: [Exchange] RE: DNS ErrorRetry So, in case anyone wonders... the reason the box isn't checked by default is:, if you have a domain hierarchy instead of a single domain or you use pinpoint DNS internally, it's possible to break internal email delivery. There is a DCR in place, submitted by the MVPs, for using the internal DNS and if that fails use the external DNS, but it's never made it to implementation. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Kennedy, Jim Sent: Thursday, November 5, 2015 10:15 AM To: [email protected] Subject: [Exchange] RE: DNS ErrorRetry TYVM, that instantly fixed it. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Michael B. Smith Sent: Thursday, November 5, 2015 9:58 AM To: [email protected] Subject: [Exchange] RE: DNS ErrorRetry 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
