Well if you will look at some of the first screen shots. When I do try to submit a e-mail any e-mail or even mine it says I cant use LATIN LETTERS, NUMBERS, SPACES, HYPHENS, and underscores… O assume that means I cant use the (@) which means one cant enter and e-mail address!
Never mind I’ll just buy MAYA!
The first line is for a username. No @ or .
The second line is for an email address.
Going by your screenshots you were trying to enter a password into the second line, not an email.
Maya is a fine piece of software. I own it. However, it has MORE than its share of issues. Also, the user forums are nowhere near as tolerant as these, so be prepared for quite a bit of nastiness about just about any question.