I am guessing that you are not using Outlook 2007. I should have mentioned that the precision of the instruction would only be accurate if you were opening a message in Outlook 2007. Are you using Outlook 2003? I am not sure if the option I mentioned is available in earlier versions of Outlook, but I assume it is, it would just be located in a different place.
But if the send option was enabled, then you're good to go. Glad you've got it figured out.