Subject: Undelivered Mail Returned to Sender
From: [email-masked] (Mail Delivery System)
To: [email-masked]
Date: Thu, 23 Jun 2011 15:02:59 +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 example.net[213.5.177.106] said: 554 5.7.1 Your
    message failed several antispam checks (SCORING) and it was rejected or
    collected on example.net spambox. Please be sure your mailserver is
    configured correctly (spf , HELO, PTR) or try using an alternative email or
    smtp. (in reply to end of DATA command)

Subject: foo
From: John Smith <[email-masked]>
To: Fred Bloggs <[email-masked]>
Date: Thu, 23 Jun 2011 15:02:55 +0100

Text