Hello, Fasih—and welcome to English Forums. That complimentary closing has not been in vogue for at least a hundred years. Use 'Sincerely yours' if you have used the recipient's name in the greeting, and use 'Yours faithfully' if you have used 'Dear Sir' in the greeting.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.