What is the best ending for an email? Select your sign-off or ending. Sign-offs are expected when ending a formal email. Theses include a polite and respectful closing such as Regards, Sincerely, Thanks or Stay Safe (a common closing used during the covid crisis). It is always best to write out full words in a formal closing of your email.
Some say what works best is Warmest Regards or Thanks is a lot better than the more formal Regards or Sincerely. Best practice to end your email is to include in your signature, which is automatically ended in your email by your email tool.