Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host mail.telecomstaff.co.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

<yamaaki.ts at gmail.com> (expanded from <yamaaki at telecomstaff.co.jp>): host
    gmail-smtp-in.l.google.com[64.233.189.27] said: 550-5.7.1 [1.33.189.238
    7] Our system has detected that this message is 550-5.7.1 likely
    unsolicited mail. To reduce the amount of spam sent to Gmail, 550-5.7.1
    this message has been blocked. Please visit 550-5.7.1
    https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1  for
    more information. s6-20020a632146000000b003aba3fbf0fcsi6371326pgm.180 -
    gsmtp (in reply to end of DATA command)
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