Subject: Undelivered Mail Returned to Sender
From: [email-masked] (Mail Delivery System)
To: [email-masked]
Date: Tue, 14 Feb 2012 14:22:51 +0000 (GMT)

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 mailhub2.bar.ac.uk[143.117.14.19] said: 550 This
    message has been identified as spam (in reply to end of DATA command)

Subject: foo
From: Fred Bloggs <[email-masked]>
To: John Smith <[email-masked]>
Date: Tue, 14 Feb 2012 14:22:45 +0000

HTML