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We discussed this error earlier here https://msexchangeguru.com/2013/11/23/451-4-4-0-dns-query-failed-the-error-was-smtpsend-dns-nonexistentdomain-nonexistent-domain/ (more…)
Posted: November 14th, 2014 under Exchange 2010, MailFlow, Tech Buzz, Tips, Windows 2012 R2. Tags: 451 4.4.0, DNS Query Failed, Mail queuedComments: 6
