how do i prevent outlook to keep re sending this email

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http://superuser.com – This message was created automatically by mail delivery software. A message that you sent has not yet been delivered to one or more of its recipients after more than 48 hours on the queue on dist012.mail.hostpoint.internal. The message identifier is: 1VYQ2b-000Dxy-C2 The subject of the message is: RE: FKMP: Photo request TY The date of the message is: Mon, 21 Oct 2013 20:19:50 -0400 The address to which the message has not yet been delivered is: Delay reason: mailbox is full No action is required on your part. Delivery attempts will continue for some time, and this warning may be r (HowTos)