Hi Katie, 

I saw your question remained unsolved. Happy to help. Could you give a bit more context, which authorization email do you mean exactly?

Are you referring to the mail where users have to confirm their registration? This cannot be turned off simply because we only want to have accounts with valid email addresses. Otherwise many emails would bounce and this would a) not reach the user but also b) could cause an issue with our email provider, if too many emails are bouncing we might get blacklisted and that would cause an issue for many other users. Of course spam prevention is also a good reason not to do this. :)