the recipient of spoofed emails. The owner of the domain you mention is certainly not a 'professional spammer'.
It might be an idea to investigate more thoroughly before posting such a thread in future, especially when you name the domain in question - the owner will probably know nothing about it. One look at the domain in question is enough to tell you that it's extremely unlikely to be spamming you. If someone is spoofing the address there's very little you (or anyone else) can do about it. In time it will die down - many of us have suffered in a similar way.