Subject: Undelivered Mail Returned to Sender
From: [email-masked] (Mail Delivery System)
To: [email-masked]
Date: Wed, 27 Jul 2011 13:24:13 +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 renko.ucs.sample.net[129.215.13.3] said: 554 5.7.1 Spam
    score (12.878) too high: see http://www.sample.net/is/email/error (in reply
    to end of DATA command)

Subject: foo
From: John Smith <[email-masked]>
To: Joe Bloggs <[email-masked]>
Date: Wed, 27 Jul 2011 13:24:07 +0100

HTML