My sister tried signing up for turkerhub and it says the email she entered has been banned? She’s new, why would her email be banned?
Might be a site filter auto banning certain email providers from creating accounts. Tagging @ChrisTurk so he can check this issue out.
Its not her e-mail specifically, its whatever domain she's using (so the @whatever.com part) is on a SPAM email list that the forum blocks.