Thank you. I don't know where it explicitly says you can't stop Quit but I believe you.

The idea is not to "hit send" for drafts in progress, which is what most people seem to be interested in. Rathe, it's to impel me to either reply, delete, or act upon open messages that I received. E.g., boss sends me an email to make a plane reservation. I get distracted and it's now underneath 12 windows. I'm shutting down for the day and closing Outlook. The message is about to close and I may not notice it for a month. Instead, upon Quit, I'd like every open received email to confront me that they're still open (and possibly need action), rather than just silently closing, and allowing me to forget about them. It's because I effectively have a pseudo "to do list" of open messages I'd like to be confronted with as I go Quit.