When you know the recipient’s name, sign it “Sincerely yours” or just “Sincerely”, or in the US “Yours truly” is acceptable. Don’t try anything more cutesy or friendly unless a) you know the recipient quite well and are certain you can be informal without seeming disrespectful, or b) you have a “trademark” letter ending that’s part of your public persona (and the talent and popularity to pull it off). Signature and printed name: Signing your name is a minimal assurance that you stand behind what was written.
Finalizing the Letter. Edit and Review: Once you are finished with writing the letter, try to look for errors. Check for spellings, punctuations, grammatical errors. Don’t Staple the Letter: Use a paperclip on the top of the left corner if there are many pages. Use of staple doesn’t look nice for a business letter. Posting of the Letter: Always use clear and correct spelling for mentioning the name and address of the recipient.