_APP_CONSOLE_WHITELIST_EMAILS

What is the correct way to use this var? Can i use the domain only (@domain.com) or should i put the full e-mail address (user@domain.com)? Can i use star (*@domain.com)?

For now Appwrite check the whole email address, so you'll need to insert the full email addresses

You can see more about in the code here https://github.com/appwrite/appwrite/blob/master/app/controllers/api/account.php#L83

It's sounds like a good idea, I didn't find any issue on that topic, so it might by good to open one.