Dear Smith's
Yes, the plural for Smith is Smiths, and the plural possessive is Smiths'.Do not forget to capitalize names; names are proper nouns.
dear Sirs:
The plural possessive form of "smith" is "smiths'".
Dear Mr./Dear Ms. followed by their surname.
EdD indicates a doctorate degree. Proper salutaion would be "Dear Doctor xxxxx:"
Dear Principal, or To Whom It May Concern, or Dear Sir or Madam
John and the Smiths took my mother on a picnic in the park.common nouns: mother, picnic, and park.proper nouns: John, and Smiths.
Dear Mr. Smith and Mr. Jones or Dear Sirs as an example
"Dear Mr. Johnson" 'Dear Ms. Johnson" Dear Mrs. Johnson" any one of these will do just put in their proper name.
Dear Counselors:
No, you do not need to capitalize "dear" in a cover letter. In a salutation, it is customary to capitalize the first word and any proper nouns, but "dear" is not typically considered a proper noun. So, you would write "Dear Hiring Manager" or "Dear Ms. Smith" with a capital letter for the first word and any proper nouns, but just "dear" on its own should be lowercase.
Dear Madam (but sign it Yours Faithfully) or Dear Miss..... (sign Yours sincerely) or Dear Mrs..... (sign Yours sincerely)