Your question seems a little ambiguous to me, but i’ll try to help.
In Outlook Express go to the Tools menu, select options. Under the general tab and under the sub heading Send/Receive, uncheck any features that check mail automatically. Click OK. Manually send receive mail. This should progpogate an instance of the e-mail in question in the outbox. Select it and delete it, and then delete it again. Close Outlook Express. If you get a message that says “There are still messages in your Outbox, send them now?” Click NO! Re-open Outlook Express, go to the Outbox, select the e-mail that is there and delete it. Go to deleted items and delete that same file.
This should work.