The correct salutation for man and wife that are doctors is:
Dr. Henry & Dr. Judith Smith or, Doctors Henry & Judith Smith. Both are acceptable.
The proper salutation for married doctors would be 'doctor'. However, you also can refer to a married doctor as Mrs. and/or Mr.
The envelope should be addressed:
Mr. J Jones and Dr. J. Smith.
All on one line, alphabetically.
The letter salutation is written as: Dear Doctor and Judge Smith. The envelope is written as: Doctor Adam Smith and the Honorable Eve Smith.
Dear Judge Smith and Mr. Smith.
The Honorable Judge Smith and Mr. Smith for the envelope and Judge Smith and Mr Smith for the letter.
Dear Judge Smith: See http://www.factmonster.com/ipka/A0771340.html for more info.
The Honorable and Mrs. (first name with middle initial, if any) Smith
His honor or Your honor is the proper salutation for a retired judge. The use of the word judge in title and introductions is not used after retirement.
Your Honor
Retired or not, the proper formal salutation should read: Honorable Walter K Smith Dear Sir:
The Honorable (similar to a judge)
You can greet a judge by calling him or her a judge. You can also call them Mr. or Mrs.
Your Honor is the most common address. Judge xxx is also acceptable.
Judges should be addressed, "your honor".