Yeah, the block us.
I some ways, I can't blame them, they probably get more email then any other site on the planet.
We also send a lot of email, some rankings list us at 100k/day overall, which is probably true. But, we send all to registrants.
We are even on some lists you can't get removed from, so, basically we are fucked for some domains.
We could switch ISP's
-Scott