Pythoncom - How to listen to Outlook Outgoing messages?

Question

At the moment I am using the below code to listen to incoming messages in Outlook from Python.

How can I do the same for Outgoing messages from my Outlook?

import win32com.client
import pythoncom

class Handler_Class(object):

senders = ['[email protected]']

def OnNewMailEx(self, receivedItemsIDs):
    # RecrivedItemIDs is a collection of mail IDs separated by a ",".
    # You know, sometimes more than 1 mail is received at the same moment.

    for ID in receivedItemsIDs.split(","):
        mail = outlook.Session.GetItemFromID(ID)
        subject = mail.Subject



outlook = win32com.client.DispatchWithEvents("Outlook.Application",Handler_Class)

# an infinite loop that waits for event
pythoncom.PumpMessages()