The from address is now accepting mail, if I wasn't clear in my first post. It looks like at least one other mailserver was rejecting email for the same reason.
I'm curious if you consider that anti-spam measure to be productive? It's on the aggressive fringe of anti-spam measures...
Proud reseller of little geisha dolls with big heads that wobble.
"Want to keep guns out of the hands of felons? Make fewer felons in the first place." --Vanya