Place Outlook in Offline mode via File-> Work Offline.
Restart Outlook and you should be able to delete it.
For other solutions see;
http:/www.howto-outlook.com/faq/messagestuckinoutbox.htm
--
Robert Sparnaaij [MVP-Outlook]
Coauthor, Configuring Microsoft Outlook 2003
http://www.howto-outlook.com/
Outlook FAQ, HowTo, Downloads, Add-Ins and more
http://www.msoutlook.info/
Real World Questions, Real World Answers
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"PaPaSurf" <(E-Mail Removed)> wrote in message
news:8B35C67E-07C8-4843-B13D-(E-Mail Removed)...
> I have an email with and attachment that will not transmit. When I try to
> delete it a window opens telling me the email cannot be opened because it
> outlook has already began transmitting. But it doesn't transmit and I
> can't
> delete it.