To end a letter to an ambassador, write Yours Sincerely. Leave three to four spaces for the signature, and then write your name.
Ambassador College ended in 1997.
Ambassador Airways ended in 1994.
If the Ambassador is currently active in the Diplomatic Service, it would be Mr. Ambassador or Madame [ Mme.] Ambassador.
Dear Mrs Ambassador..
In a letter to a Caribbean ambassador, the appropriate salutation is "Your Excellency." This formal greeting acknowledges the ambassador's diplomatic rank and position. Following the salutation, it is customary to address the ambassador by their title and last name, for example, "Your Excellency, Ambassador Smith."
On the Envelope His/Her Excellency Mr./Ms./Dr./Rev. [name] Ambassador (or High Commissioner) of [country in full] In letter Dear Mr/Mrs Ambassador
An internuncio is a papal envoy or messenger but ranks below a nuncio, or ambassador.
Ambassador.
attashe
Best I can do on this one: Since the person is not officially an ambassador yet, you would address the letter as follows: Dr. John Smith Ambassador Designate to Oklahoma <<at his present address>> In the greeting of the letter, refer to him by his present title: Dear Dr. Smith, etc. In the opening of the letter, it is always proper to congradulate him on his appointment. After his becomes official, then you would address the letter to: Honorable Ambassador John Smith Embassy of the United States 123 Any Street Omro, Oklahoma 12345 and in that greeting: Dear Honorable Ambassador Smith...
The de Lome letter.
The Delome letter