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RE: SMTP error 451 Unable to complete command, DNS not available or timed out ~Vanessa Lopfoozenoni 24.Oct.03 08:55 PM a Web browser Domino Server 6.0.2 CF1Linux - RedHat
I made the following change in Domino Administrator -> Configuration -> Messaging -> Messaging settings -> Restrictions and controls -> SMTP Inbound controls -> Verify sender's domain in DNS
Changed it from "Enabled" to "Disabled"
The server now happily accepts mail. But I think this is not really a solution but just a workaround.