Subject: Undelivered Mail Returned to Sender
From: [email-masked] (Mail Delivery System)
To: [email-masked]
Date: Wed, 27 Jul 2011 14:14:36 +0100 (BST)

This is the mail system at host admin1.example.co.uk.

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

<[email-masked]>: host inbound.registeredsite.com[66.97.46.122] said:
    554 5.7.1 The message from
    (<[email-masked]>)
    with the subject of (foo) matches a profile
    the Internet community may consider spam. Please revise your message before
    resending. (in reply to end of DATA command)

Subject: foo
From: Julia Stevens <[email-masked]>
To: Fred Bloggs <[email-masked]>
Date: Wed, 27 Jul 2011 14:14:34 +0100

HTML