Dear ms
His Excellency, Ambassador of ................... This salutation can be used when writing to the Forein ambassadors of all countries.
Honorable Consulate
Consul of China
Dear Sirs and Madam:
Walter J. Smith, Jr., MD. Never use Dr and MD (or PhD) in the same name.
I BELIEVE THE CORRECT FORM WOULD BE: DEAR DR. AND MRS .....
If being formal, he/she is referred to as doctor.
Dear Father, Dear Reverend Father or Most Reverend Father
Desmond Tutu was a Bishop, so the correct salutation would be, "Your Excellency".
Sir and Ma'am. Or, you refer to them by their rank, as in "Greetings, Colonels Smith."
the correct salutation for two men is Messrs
"Dr and Mrs Smith" is the correct salutation. (With Smith replaced with the correct surname)