I tried to create another account for mule purposes but I was unable to. I tried several times with a few of my spare email addresses but whenever I click register after filling in everything, the website just brings me back to the home page without any message saying I've successfully created my account whatsoever. I checked all my email addresses I've used trying to create my account with and I have not received any account confirmation emails. I then tried creating an account again using my spare emails and the website just tells me that the username or email is already being used. I am very certain that the usernames that I tried using for my new account are not taken.
There is no confirmation message. All of the accounts you tried to create, did in fact get created. You could have tried logging into your newly formed account in the game to see if the registration was successful as well.