One thing I've found that helps a lot is instant delivery notifications. When you try to register a new account, our "We've sent a confirmation email" screen wi

One thing I've found that helps a lot is instant delivery notifications. When you try to register a new account, our "We've sent a confirmation email" screen will report within a few seconds if there was a mail delivery error and allow the user to correct their address. Common typo detection for popular email domains is also beneficial (https://github.com/mailcheck/mailcheck https://github.com/mailcheck/mailcheck)