Hi, I use 'Yours sincerely' when I write a business letter on paper. Rarely on an email. I never use 'Yours faithfully'. Best wishes, Clive

Hi, This seems very terse. Don't you want to say what is incorrect about them? Don't you want to add a little bit of politeness? Best wishes, Clive

In my opinion, simpler is better. Sincerely, CJ

I need help with writing a formal business letter to customers who request for order cancellation due to vaiorus reasons.

I'm not sure what you're asking. There are as many types of letters as there are reasons for writing them.

It is wrong. If anyone is kindly, it is the other person, not the one who requests; however, 'kindly' is not used in AmE/BrE English business letters as it is in Indian/Asian English.

what are the classifications of business letter?/// pls answer me..

No, "Dear sir" ends with "Yours faithfully" and "Dear Mr Smith" ends with "Yours sincerely". Both are for formal business letters. (A good trick to remember them is that the two S's - "sir"

No! Sincerely yours is for business letters. Kind regards is informal.

If it exists, it will be among the Google hits.