In your account, do you have "allow others to view my e-mail address" checked?
No, mine is not checked. And I still get the occasional spam directed at differentnames@amiga.org (mostly Blomberg (obviously) and bluewolf)
I think the spam spider went over our memberslist, which I have now disabled, but if that's true, we might not need to delete the e-mail forwarding (something I desperately do not wish to do).
I hope it doesn't require that kind of action, the member list is a big enough loss :-(
But do what you have to do, I'm sure we'll survive :-)