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The mail system

hiro-pooh22deaf@jcom.zaq.co.jp (expanded from kita@deaf.tokyo): Host or domain name not found. Name service error for name=jcom.zaq.co.jp type=A: Host not found

hiro-pooh22deaf@jcom.zaq.ne.jp (expanded from kita@deaf.tokyo): host mgw2.mx.zaq.ne.jp[111.96.117.214] said: 550 RCPT TO:hiro-pooh22deaf@jcom.zaq.ne.jp User unknown (in reply to RCPT TO command)