As pointed out by samstave in a comment at https://news.ycombinator.com/item?id=23209348 : You send an email to this service to post a blog entry, and this service exposes your name and email address (as obtained from the email headers) to everyone! That’s a huge privacy disconnect in a world where exposed emails can cause a lot of problems, and more so for non-technical people, which this service intends to make thi…
Leaving aside that a site like this is so wide open for abuse of all kinds it won't last five minutes, I don't even see the advantage of submitting a form at an email provider over simply submitting a form directly on the site.