Is there no other chance to work with mailitems befor or after sending?

If not, is their a way (dirrent API or methode) to change the initiating
tool, which uses currently Simple Mapi (function: MAPISendMail) for
sending an Email with the purpose that Outlook coult recognize a
NewMail-Inspector?

Ken Slovak - [MVP - Outlook] schrieb:
No, in that case you're out of luck. Not only does NewInspector not fire
but after the item opens it's not even in the Inspectors collection.