Hrm, do you not see a Reply button? Some of the forum buttons were disabled for guests for a while, so if that is the case, let me know and I will poke Togan to restore it.
Before I posted a response in the other thread, I tried removing adelphia.net from the free e-mail list in case someone had added it by mistake, as that could very well result in that message you received. I don't see any matches for your e-mail address, but I did just approve a different adelphia user since then, so you shouldn't have any trouble registering now.
If you do, just register with a different e-mail address (any fake e-mail address will do) and let me know what handle you used to sign up, and I can change it to the adelphia e-mail for you.