This isn't a question. Why do people waste time like this with fragmented sentences and broken English?
An ex-ambassador is often referred to as a former ambassador or a retired ambassador.
Ambassador William Smith, 00000 Chelsea Place, Seattle, Washington U.S.A. 0000000 (area code #) Dear Ambassador Smith: NOTE: Keep everything precise and to the point (easy reading) when writing ANYONE in an important position (even business.) People are busy and they want to read your letter with a point being made and if you can have a resolve to the problem (you don't always have too) but it's appreciated.
Andrew Young is the former mayor of Atlanta and U.S. Ambassador to the United Nations. His last name begins with the letter Y.
Andrew Young
If the Ambassador is currently active in the Diplomatic Service, it would be Mr. Ambassador or Madame [ Mme.] Ambassador.
Dear Mrs Ambassador..
James R. Sasser, a former three-term U.S. senator from Tennessee was ambassador to the People's Republic of China from 1995-1999.
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."
Address him in business by his current title . You may introduce him socially as the former Ambassador to Whereverstein., currently serving as Deputy Commandant of /to[his superior officer or place of posting]Whom or whatever.
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
Arnold Schwarzenegger
The former Spanish Ambassador to the United States with the first name Jaime is Jaime de Ojeda. He served in this role and contributed to strengthening diplomatic relations between Spain and the U.S.