This is the Postfix program at host srv5.med.gunma-u.ac.jp.
I'm sorry to have to inform you that the message returned
below could not be delivered to one or more destinations.
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 message returned below.
The Postfix program
<osamuishi@...>: unknown user: "osamuishi"