You received spam/uce/unwanted email from an address that seems to be from @snake.de? Have a closer look at that email, especially at the Received: header lines. Then you'll see where it really comes from. The IP addresses involved are somewhere on this planet, but not within my network or administrative reach. Some even claim to be somehost.snake.de, but if you look up the IP address, you'll see, it's not.

You don't see any Received: lines?
Tune your mail reader software. Almost every email software has such a setting, even that crap called Microsoft Outlook and also most of the webmail interfaces.
You still think, it came from snake.de?
Have an even closer look in the mail header, it did not!

I don't know why they picked my domains (it's not only snake.de), but spammers need to abuse someone else's domain to send out their shit, so in your case they picked one of my domains.
I have nothing to do with that email. I do everything I can to prevent spam/UCE and run a lot of mail filters of various types to avoid receiving or even forwarding that kind of internet plague.