I'm not a spammer

Looks like someone is using the domain "decafbad.net" for the return address of their spam (as noticed by all the bounce messages I've received). Let me be clear: I am not a spammer, and I will never spam you. I think spam is despicable, and I will never harbour or send spam. decafbad.net is my domain, and I will vigilantly protect it. The last thing I need is to have my domain blacklisted by some admin who thinks that I'm just a spam domain.