My bad, this was totally me. Those emails are nothing to worry about, and I'm sorry about them.
I don't know how it happened - the server doesn't have the necessary software installed to send mail properly, unless I screwed something up. And there's no real user data on there also. I will definitely investigate and figure out what happened.
And yes, 6gcdev.net is the development stack on the new server where I'm rewriting 6GC and whatnot. But please stay off of it, haha. It was going to be security through obscurity, but now I'm actually gonna implement something on there right now so people can't get on to it.
P.S. I changed your thread title to be a little bit more descriptive, since others will probably also be curious.