451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain « MSEx

451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain « MSEx

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日期:2025-05-06
This blog post is to address a specific issue with mailflow and DNS query 2 exchange 2010 servers – exch1 and exch2 Exch1 is the ... ... 451 4.4.0 DNS query failed. The error was: SMTPSEND.DNS.NonExistentDomain; nonexistent domain This basically means ......看更多