Subject: Undelivered Mail Returned to Sender
From: [email-masked] (Mail Delivery System)
To: [email-masked]
Date: Mon, 15 Nov 2010 14:35:07 +0000 (GMT)

This is the mail system at host server4.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 mx-ha01.web.de[217.72.192.149] said: 550
    <[email-masked]> Benutzer hat zuviele Mails auf dem Server. / User
    has too many messages on the server. (in reply to RCPT TO command)

Subject: Foo
From: John Smith <[email-masked]>
To: Fred Bloggs <[email-masked]>
Date: Mon, 15 Nov 2010 14:35:07 +0000

HTML goes here.