I'm wondering if it's a virus. Notice it's showing you as the sender, with messages failing to recipients, as though you sent it when you didn't. And it's coming from postmaster at Hotmail where your email is. That's something viruses will do - send junk out "from" you when it's not you. Then when they can't be delivered, it comes back to you. Which would also account for getting 300 in one week.
If that's the case, not much you can do, unless Hotmail has a virus filter and I'm not sure it's that fancy. (If you're downloading to an email client, do you have a virus scanner than scans downloaded email?)
Just delete them, and for future reference always protect your own account. You won't be able to help all the stuff like this. I get them occasionally. (Or a lot when there's a new outbreak.)
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