Subject: Undelivered Mail Returned to Sender

From: [email-masked] (Mail Delivery System)
Date: Tue, 4 Mar 2008 03:16:58 -0500 (EST)

This is the mail system at host mailbox-us-s-1.mailhostingserver.com.

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 67.15.184.110[67.15.184.110] said: 554 qq
    permanent problem (#5.3.0) (in reply to end of DATA command)