It's important to have good email etiquette especially in business or formal emails. Here are four formal and four informal ways you can sign-off your emails. These are just some of the most commons ones that people use these days.
In some cases, when you're writing an email to someone you've never met, you can use "Yours faithfully," however, I don't see it used very much these days. It seems like people just use "Sincerely." Have any of you received emails or written emails using "Yours faithfully"? Which one of the salutations here do you use most?