This is the Postfix program at host mail02.ops-netman.net.
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The Postfix program
mail.ops-netman.net[2001:408:1009:1:2d0:a8ff:fe00:4bc4] said: 550
<psgctgdhpttpuuyzow@...>: Recipient address rejected: User
unknown in virtual alias table (in reply to RCPT TO command)