Richard, > The BRBL may have listed the entire /24 that includes your sending IPs. > Painful experience has shown that Barracuda won't hear your requests for > delisting, and the listing may never go away.
I believe you've got it in one. I heard back from a colleague on the same /24 (though not the same address!) and he had a client with a bad WordPress install that was generating spam. That seems to make this EmailReg situation even more egregious -- if they're really blocking whole networks based on a single IP then it really is a protection scheme operated (opaquely) by Barracuda. "Pay us money if you want mail to get through to our customers; we'll blacklist you arbitrarily otherwise." How can this possibly be legal under US racketeering laws? --Jered
