Greetings should not be used to sign anything off as it is a way of saying 'hello'. Letters (British English) formal Yours sincerely - when you know the name of the person so have addressed it to Mr/Mrs/Ms X Yours faithfully - when you don't know the name of the person so have addressed it to Dear Sir/Madam informal Kind regards Best wishes e-mails These are normally less formal so the informal sign-off as above are usually most appropriate.
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