What is the most formal way to start a letter?
Dear Dr. Smith, ... com/Write-a-Letter#Writing_a_Formal_Letter_sub
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This is the most general and formal:
Dear Sir or Madam:
If you know the name of the contact person:
Dear Mr. Smith:
According to
https://www.thebalance.com/business-letter-salutation-examples-2059704
regarding the use of a co