I had something similar happen to me the other day - I was downloading OS software and they asked for an email address. I put in my gmail address, as I didn't mind getting emails from this provider, and it bounced back, saying that it didn't accept email addresses from that domain because of spam. I popped in an old Yahoo email and it went through :huh:
In any case, if the "blade" I'm thinking of is the one you wanted to use, you have to have an increased membership to sell, too, but it is very active and you'd probably get lots of interest if you're selling decent stuff..