I know not logging in is the basic premise of your website, but I'd also like to be able to read more than just the one post I found written by that author. Rather than search his tweets, and facebook posts, and any emails he's ever sent me for a mailp.in link.
Is there a way you can have sub-domains such as [username].mailp.in/[post address]
Perhaps the username is a hash of the email address to keep the privacy of the user. Not a deal-breaker but it'd be nice.
Having done a lot of camping in my time, this was the first thing I thought as well. If you haven't got somewhere to poop and somewhere to get rid of it, life is miserable. Believe me, burying it isn't fun.
Seems like one of those idealistic almost art project houses rather than something you could actually live in.