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https://practical365.com/exchange-server/messages-queuing-error-451-4-4-0-dns-query-failed/
Oct 16, 2014 · When we use FQDN of server as smart host (Linux server) to relay emails we are getting DNS 451 4.4.0 DNS query failed. However when we use IP Address of the server it is working fine. Any idea what could be the issue.
https://social.technet.microsoft.com/Forums/en-US/90222631-e5dd-4ef7-b39c-b0234a18b28e/451440-dns-query-failed-exchange-2010-smtp-connector
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https://community.spiceworks.com/topic/448672-exchange-2013-email-error-451-4-4-0-dns-query-failed-infonorec
Oct 18, 2017 · Solution: and there's no entry in the hosts files locally or as a conditional forwarder in your DNS servers for this domain?it all works fine from hereHow about4.1/5(16)
https://www.experts-exchange.com/questions/26431948/exchange-2010-edge-transport-server-emails-are-stuck-in-a-local-loop.html
Find answers to exchange 2010 - edge transport server, emails are stuck in a local loop from the expert community at Experts Exchange
https://kx.cloudingenium.com/microsoft/exchange-edge-2010-451-4-4-0-dns-query-failed/
What causes 451 4.4.0 DNS query failed on Exchange Server 2010? After installing Microsoft Exchange Server 2010 Edge and subscribing to it all my emails were hanging on the queue and not being delivered to the hub server. I had all my network cards set up with my DNS server so I wash´t expecting any issues but I kept seeing the 451 4.4.0 DNS query failed message.
http://forums.msexchange.org/Messages_remain_in_SMTP_queue/m_1800434632/tm.htm
Apr 03, 2007 · Posts: 43 Joined: 4.May2006 Status: offline Solved: a smarthost userid / password wasn't necessary because I used my providers' network to send the messages.
https://www.experts-exchange.com/questions/26532846/451-4-4-0-535-5-7-3-Authentication-unsuccessful-Attempted-failover-to-another-host-but-that-did-not-succeed-Either-there-are-no-alternate-host-or-the-delivery-did-not-succeed-to-all-alternate-hosts.html
451 4.4.0 Primary target IP address responded with: "535 5.7.3 Authentication unsuccessful. Attempted failover to another host, but that did not succeed. Either there are no alternate host or the delivery did not succeed to all alternate hosts."
https://www.youtube.com/watch?v=hzxxuTHGZqI
Mar 29, 2016 · Fix exchange server error 451 4.4.0 dns query failed. exchange 2010 dns lookup failed error resolution. http://goo.gl/Xz41h4 Know cause and symptoms to the e...Author: EmailDoctor
https://supertekboy.com/2013/10/12/451-5-7-3-cannot-achieve-exchange-server-authentication/
Oct 12, 2013 · The first was IP restrictions that had been put in place on the Default SMTP Virtual Server properties.To get to these properties:
http://msexchangeguru.com/2013/11/23/451-4-4-0-dns-query-failed-the-error-was-smtpsend-dns-nonexistentdomain-nonexistent-domain/
Nov 23, 2013 · This blog post is to address a specific issue with mailflow and DNS query 2 exchange 2010 servers – exch1 and exch2 Exch1 is the ...
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