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RE: SMTP error 451 Unable to complete command, DNS not available or timed out ~Gus Opresaburakol 25.Oct.03 01:41 AM a Web browser Domino Server 6.0.2 CF1Linux - RedHat
On windows, I had the same issue recently. According to other threads, I needed to verify that all nics, either enabled or disabled, reguired valid DNS servers to be in their configuration. Hope this helps.