[Terretta]

The password is for visiting, not for posting. If you set a password, nobody can visit your blog w/o the password.

http://posterous.com/help/private_sites

"You can set a password on your Posterous site so only the readers you want can see it. To see your site, a user must go to your site url and also enter the correct password for your site."

[borisk]

Right, my bad. Still there is an option to receive confirmation link for each post.