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.