This is the Postfix program at host d2-spool.NTCU.net.

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 Postfix program

<cia.ep92@d2-spool.NTCU.net>: cannot append message to destination file
    /var/mail/cia.ep92: error writing message: File too large