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 things easy for.
One look at the homepage of this service shows all the email addresses used by the users to post. Since the service also claims (in another comment here) that spoofed email addresses won’t work, users must use a non-personal address and name if they don’t wish to expose their information publicly.