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You're looking for a polite and formal way to end an email, instead of using the more casual "Best regards" or "Kind regards".

Here are some alternatives:

1. Sincerely: This is a classic choice that conveys respect and professionalism.
2. Yours faithfully: This is a more formal option that is often used in business emails.
3. Yours truly: This is another formal option that is similar to "Yours faithfully".
4. Kindly regards: This is a polite and professional way to end an email, while still being slightly more formal than "Best regards".
5. Respectfully: This is a good choice if you want to convey a sense of respect and professionalism.
6. Cordially: This is a more formal option that is often used in business emails, especially in industries such as finance or law.
7. With appreciation: This is a good choice if you want to express gratitude or appreciation for the recipient's time or consideration.
8. Thank you: This is a simple and polite way to end an email, especially if you're thanking the recipient for something.

Remember to choose a closing that fits the tone and style of your email, as well as your relationship with the recipient.