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Messages Queuing with Error 451 4.4.0 DNS Query Failed
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日期：2026-04-25
Outbound email messages may queue on an Exchange Server with error 451 4.4.0 DNS query failed. ... Your solution worked a treat! I had a client who has Server 2012 R2 and Exchange 2010 and emails were very delayed and I couldn’t figure out why....看更多
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