Dear Sirs and Madams:
I am not sending you spam. Someone has harvested my domain name and is using it as a return address for their demonic crap emails.
Though I wish I could do something about it, I can't. This is unfortunate, because I get all of the bounced emails, which is annoying, and I also get emails from irritated people along the lines of this:
who the hell are you, what the hell is this, and why the hell are you sending it to me?
Get a good spam filter, and understand that the return address on an email is not necessarily an indicator of its origin.
Best wishes,
thevieve