You have several options for forwarding the message as an attachment depending on your version of Outlook.

1. Open the message you wish to forward
2. Click the ... icon and select Forward as Attachment.  The message is then attached.  Type any needed information in the body of the message and click Send.
   
     or 
   

OR

1. Start a new message.
2. Move and resize the new message window and Inbox windows so you can see both windows at once.
3. Select the email that you want to forward.
4. Drag it and drop it into the body of your new message.

or

1. Start a new message.
2. Right click on the message to forward and choose Copy.
3. Right click in the body of the new message and choose Paste.

or

1. Start a new message.
2. Select Attach Item from the toolbar.
3. Select Outlook Item.
4. Browse to the message you are inquiring about, and select it to attach it.

  To view the full headers of message

1. Open the message.
2. Select File | Info | Properties.
3. The headers will be in the section marked Internet Headers.
4. Click in the Internet Headers section then press Ctrl+A to select all
5. This can be Copied (Ctrl+C) and pasted (Ctrl+P) into a forwarded copy of the message.