[Kolab-devel] Undelivered Mail Returned to Sender

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<hartsuiker at kolabsys.com>: host mx03.kolabsys.com[10.1.0.2] said: 550 5.1.1
    <hartsuiker at kolabsys.com>: Recipient address rejected: User unknown in
    relay recipient table (in reply to RCPT TO command)
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