How to detect the event "BeforeSendMail" in Word?

[Frenchy]

Hello,

I developed an add-in for Word 2003 using VS 2003 C# Extensibility project.

All works fine but I have to detect when the user send a mail using Word. So
I searcher for an event, but there's none

So I'd like to know how I could detect when a user send a mail from Word?

I'm not talking about Outlook using Word as mail editor, but the function in
Word 2003 where you can send an e-mail...

Someone talked me about "hook" but I have no idea what it is.

Thanks in advance