Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host borg4.vdomains.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

<koyhoge@gmail.com> (expanded from <koyama@hoge.org>): host
    gmail-smtp-in.l.google.com[173.194.79.27] said: 552-5.7.0 This message was
    blocked because its content presents a potential 552-5.7.0 security issue.
    Please visit http://support.google.com/mail/bin/answe 552-5.7.0
    r.py?answer=6590 to review our message content and attachment content 552
    5.7.0 guidelines. bc2si6494617pad.245 - gsmtp (in reply to end of DATA
    command)
-------------- parte successiva --------------
Un allegato non testuale è stato rimosso....
Nome:        non disponibile
Tipo:        text/rfc822-headers
Dimensione:  1072 bytes
Descrizione: Undelivered Message Headers
URL:         <http://lists.linux.it/pipermail/tp/attachments/20131102/e45fa4a5/attachment.bin>