I tried gmail + mailinator sign up, no email yet.
When you even enter your email "gmail.com" pops up on the list. So you wouldn't think its a banned domain?
There is a 31 page thread on Metcal handle teardown...
Will try the QQ sign up later on a spare phone.
edit: couldnt sign up for QQ, said my phone number was suspicious. I think all of NA is blocked from registering for it.