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                   The mail system

<akharrer13@gmt.de>: host mx19a.antispameurope.com[94.100.132.100] said: 550
    5.1.1 <akharrer13@gmt.de>: Recipient address rejected: undeliverable
    address: host mail2.gmt.de[87.138.185.221] said: 550 5.1.1
    <akharrer13@gmt.de>: Recipient address rejected: User unknown in virtual
    alias table (in reply to RCPT TO command) (in reply to RCPT TO command)