[USC-CSEE] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host maili2.kaapeli.fi.

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

<sa.kuikka at kaapeli.fi>: host mx.kaapeli.fi[212.16.172.21] said: 550
    <sa.kuikka at kaapeli.fi>... User unknown (in reply to RCPT TO command)
-------------- next part --------------
An embedded message was scrubbed...
From: <usc-csee at cs.hanyang.ac.kr>
Subject: Friendship, love, passion and trust - this is what I'm looking for!
Date: 31 Jul 2018 07:50:46 +0200
Size: 1513
URL: <http://cs.hanyang.ac.kr/pipermail/usc-csee/attachments/20180731/dcdbf55d/attachment.mht>