Here's how to write it correctly:
Respectfully yours,
You can use a comma after the closing phrase, but it's not strictly necessary.
Example:
Dear Mr. Smith,
Thank you for your time and consideration. I look forward to hearing from you soon.
Respectfully yours,
[Your Name]
Note:
* "Respectfully yours" is a more formal closing than "Sincerely yours" or "Regards."
* It is often used in business correspondence, academic writing, and official communications.
* In informal settings, it is generally better to use a more casual closing.