I have been told that I should use "Best regards" in emails. However, I also see many native English speakers using "Best Regards". I'm confused which is correct.
The rule for formal letters is that only the first word should be capitalized (i.e. "Best regards"). Emails are less formal, so some of the rules are relaxed. That's why you're seeing variants from other native English speakers. It would never be wrong, however, to continue using "Best regards" for emails.