I feel like I covered my bases with the rest of my comment there. If you have thousands of photos that you want to share, host them on your server and whitelist the people you want to see them :/

IRL I've never sent nor received more than a handful of pics at a time, and always through email. It would have never occurred to me that people are out there sending the whole family collection to each other digitally. Grandma hordes those pics for a reason; as leverage for people to visit her!