[Mailman-Users] Is there a way to strip incoming images and replace them with a link?

I am new to Mailman. I converted my lists from Surgemail to Mailman a week a go. I seem to have things running so far, but I have a question. If there is a place to read about this, Just point me to the correct document.

I would like to find the spot in Mailman where incoming messages get stopped for moderation and remove all images from the post. But instead of just tossing them, and if the moderator approves them, I would like to save the image to a webserver directory and replace the image in the post with a link to the saved image.

So my questions are:

1. Can this be done at all?
2. Can it be done safely?
3. Has it already been done?
4. Where should I focus my reading if I want to do it?

Thanks for any pointers you can give me. -Chuck-