[Trhm-Go] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host mailgate-sg1.hines.hokudai.ac.jp.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<ahodori7 at env.agr.hokudai.ac.jp>: host orange.agr.hokudai.ac.jp[133.50.195.10]
    said: 550 5.1.1 <ahodori7 at env.agr.hokudai.ac.jp>: Recipient address
    rejected: User unknown in local recipient table (in reply to RCPT TO
    command)
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