The optional parts of a business letter are only important if they are applicable.
For example, a reference line would not be necessary for all business letters and serve no purpose unless there was something specific to reference. If the letter is sent to the recipient only, there would be no need to use the "cc" reference; or if nothing is included with the letter, the "encl." notation would be of no importance.
If any of the optional parts of a business letter are applicable, then they are important to use.
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Optional parts of Business Letters are;1) Attention line2) Subject line3) File or account number4) Enclosure notation5) Copy notation
Optional parts of Business Letters are;1) Attention line2) Subject line3) Enclosure notation4) Copy notation5) File or account number6) Mailing notation7) Postscript
Standard parts of a business letter:letterhead (or senders address for plain paper),date,inside address,salutation,body,complimentary closesignaturename of sender printed or typedOptional parts of a business letter:reference lineenclosures listedcopy (Cc)
Optional parts are those parts of a letter that we use when required. They are;Attention line (the specific person or department to whom your the letter is directed)Subject or Reference line (an account number, product, or specific topic of the letter)Enclosure notation (list anything that is included with the letter)Copy notation (list any person or department that will be receiving copies of the letter)Mailing notation (to note if the letter is registered, certified, next day, etc.)
Parts of a business letter:headingInside AddressSalutationbodyclosingSignature