How to catch events from an outlook mailitem object from an Excelmacro

I have a macro in Excel that creates an Outlook MailItem but only
displays it so that the user can modify it before sending. While the
user modifies the message, I would like the macro to wait until the
user either sends the message orl discards it, and then retrieve the
user's decision.

Is it possible from Excel to catch the events of the Outlook mail item
object?
Has anyone code sample that would show how to do this?
Other suggestions?

regards.