Good! I created a similar thing last year when Posterous died; it sill exists and although it never got any traction I still use it for my blog; it's called urgeous.com and has an API that lets users use it as a service (posts can be displayed from your own domain while being hosted by Urgeous).
Your positionning is certainly superior though, because 'mail2web' is simpler and more fun than 'yet another blogging platform that uses email'...
I never got around to turning attachments on because I was afraid of the hosting costs; how do you plan on dealing with those?
"I never got around to turning attachments on because I was afraid of the hosting costs; how do you plan on dealing with those?"
As long as users don't delete their posts, we keep them (including attachments) there. If we are running out of storage space, we can add more machines :)
Your positionning is certainly superior though, because 'mail2web' is simpler and more fun than 'yet another blogging platform that uses email'...
I never got around to turning attachments on because I was afraid of the hosting costs; how do you plan on dealing with those?