I'm wondering what the trigger events are in outlook. Specifically, is there a trigger when the sender is changed?

I am able to send emails from different mailboxes and would like to write a small script to change some settings depending on which address I will be sending from.

I keep forgetting to do certain small things that can get to be pretty aggravating and what I would like to do is have a macro disable the delivery and read receipts when I select a different sender.

Perhaps there's another way?