What IS this email I keep getting?

I’ve got my own domain, herein referred to as mydomain.org. For quite a while now I’ve been getting this weird sort of email, which I’ll post here:

What the heck is that thing? Like I said, I’ve received it multiple times, and each time the name (as in name@mydomain.org is different, and it’s always some sort of collection of random letters. What can I do about this?

Thanks in advance!

It’s stuff that gets sent out automatedly to see if it gets bounced back. No bounceback = valid email address. The person doing this is either a spammer or someone compiling a list of valid email addresses to sell to spammers.

Actually it’s a spamming device that attempts to bypass your filtering by being redirected through an innocent, but insecure, third party web-server.

They’re abusing the FormMail.pl script on the insecure open server, which is designed to allow web-browsers to send feedback email to a web page’s author. This is why the email always starts “Below is the result of your feedback form.” Ultimately it works as an anonymous redirector, perfect for spammers.

The rest of the email is either spam or a virus.