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Posts Tagged ‘451 4.4.0’

Exchange 2013: 451 4.0.0 DNS query failed

Today I got 2 issues which are interesting so I am sharing the experience.
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Exchange 2010: Message Queued with 451 4.4.0 Dns query failed

We discussed this error earlier here http://msexchangeguru.com/2013/11/23/451-4-4-0-dns-query-failed-the-error-was-smtpsend-dns-nonexistentdomain-nonexistent-domain/
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migrate exchange to office 365

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