The password for TMI posts is "TMI", to make them opt-in for those who don't wish to read about gross bodily functions. Email for Password means just that; there may be up to several days' lag depending on which email address you use.
It should come as no surprise to anyone that I think this is a really cool idea: it's a card game, called Glossotechnia, in which the players create a mini-conlang over the course of play.