[H-SASIG] Undelivered Mail Returned to Sender

[Mail Delivery System]

This is the mail system at host excalibur.humbug.org.au.

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

<clinton.roy at gmail.com> (expanded from <list-admin at humbug.org.au>): host
    gmail-smtp-in.l.google.com[74.125.28.27] said: 552-5.7.0 This message was
    blocked because its content presents a potential 552-5.7.0 security issue.
    Please visit 552-5.7.0  https://support.google.com/mail/?p=BlockedMessage
    to review our 552 5.7.0 message content and attachment content guidelines.
    128si8375187pfd.468 - gsmtp (in reply to end of DATA command)
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