Oh.
Yeah that might be a formatting artifact. Or it might speak to the fact that we just receive far more than we send.
Many of the emails are digests or new articles. Like the NYT might send out a headlines email. And you just receive it, and aren't going to respond, so it only gets a "from"; no "to".
There is a lot of just... Crap in there. At least two partial books. Random stuff from forums and threads.