Salutation for a judge?
In court, it is common to address the judge as "Your Honor."
Depemdng on the court "Your Worship". "My Lord/Lady"
What is the proper saluation for mr and mrs Smith when mrs Smith is a judge and mr Smith is a doctor?
Anotonyms for salutation (meaning greeting) would be dismissal or farewell. Antonyms for salutation (meaning praise) are disapproval, demerit, calumny, condemnation, or criticism. We say hello with a salutation; we say goodbye with a valediction. This is also the term for the polite closing in a letter.
The appropriate salutation depends on whether you also are a solicitor in your own country. If you are a female attorney too, then the appropriate salutation is "Chère Consoeur". However most French lawyers use the "Cher Confrère" salutation regardless of the gender of their interlocutor. If you are a man, you can write "Cher Confrère". If you are not an attorney, then the appropriate salutation always is 'Cher Maitre' or simply "Maître".
The relationship between the salutation and complimentary close is that they should be equal in familiarity or formality, based on the writers relationship of the writer and the recipient. For example, the salutation "Hi Mom" wouldn't close with "Most Sincerely", or the salutation "Dear Mr. Collins" would not close with "Love Ya".