Write an article based on this "Pick a sign-off that matches the tone of your email. Use a sign-off that fits your purpose. Avoid anything too affectionate. Skip the sign-off in brief or chain emails."
If your email is formal, sign off with something like “Best regards,” or (for an even more formal touch) “Sincerely.” For less formal emails, you may be fine using something like “Take care” or “Cheers.” If you’ve had previous emails from the person you’re writing to, you might look at their sign-off and match your tone to theirs. For example, if they tend to sign with something like “Warm regards,” you should sign off with a similar level of formality. Like the closing sentence, a sign-off can also reflect the purpose of your email. For example, if you’re making a simple request or briefly expressing gratitude for something, you might use a sign-off like “Many thanks,” or “Thanks so much,” followed by your signature. Unless you know the person you’re writing to very well, avoid anything too slangy, informal, or affectionate. In general, things like “Love,” “XOXO,” or “Hugs” should not be used in business emails. If your email is part of a long chain, or if you’re trying to communicate something very briefly and quickly to a co-worker, it may not be necessary to include a sign-off at all. If you don’t feel comfortable skipping the sign-off altogether, a simple sign-off like  –Bernice or –B. should be just fine for brief, informal emails.