Any Ideas about how to block this sort of spamming

Some mob in Russia are sending out mass emails which appear to come from one of my sites.
the url is motocrossdirect.com and the emails are from
dctsyfnre@motocrossdirect.com etc.

The email is some advert for a mass emailer.

Anyway, I'm getting all the returned undeliverable emails.

Is there any way I can stop this. or anything I can do about it.
They are not emailing via my server, at least not that I know of, just hijacking my domain name.

Thanks
Stew

 

 

 

 

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