Except in an academic setting, she will usually be addressed as Mrs. rather than as Dr.
Hello.
addressing attorney and wife
Rabbi and Mrs.
Dr. and Mr. Smith.
Dr. and Mr. Smith
vmrs
Dear Mrs Ambassador..
"Dr and Mrs Smith" is the correct salutation. (With Smith replaced with the correct surname)
probabaly just a mrs. would suffise
Dear Judge Smith and Mr. Smith.
Dear Mr. John and Rev. Sally Smith,
What is the proper salutation for a register of wills, e.g. Honorable John White?