That can be done, and the event is the Send() event.

Signature
Ken Slovak
[MVP - Outlook]
http://www.slovaktech.com
Author: Professional Programming Outlook 2007.
Reminder Manager, Extended Reminders, Attachment Options.
http://www.slovaktech.com/products.htm
>I would like to write an add-in for Outlook 2007 that will prompt the user
>to
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> the
> "Send" button in an email?