A system that receives pictures in email, stores them on a server, preferably free and reliably online, and returns the image URL. For a smallish forum, so not

A system that receives pictures in email, stores them on a server, preferably free and reliably online, and returns the image URL. For a smallish forum, so not massive. It's actually on my "can I make this?" list. Problem is that people have to upload to various image hosting sites, and this confuses beginners who are familiar only with emailing or messaging images. And then, getting the right image URL to post. Message instead of email?