Rabbi and Mrs.
vmrs
Dear Mrs Ambassador..
Hello.
addressing attorney and wife
Dear Mr. John and Rev. Sally Smith,
Dr. and Mr. Smith.
Dr. and Mr. Smith
A letter would be addressed to Mr. and Doctor. If they are both Doctors it would be Doctor and Doctor.
You could address it to Reverend and Reverend Smith. The alternative would be the Reverends Smith.
"Dr and Mrs Smith" is the correct salutation. (With Smith replaced with the correct surname)
Assuming a business letter to husband and wife with different last names who you don't know the proper business salutation is to have the the wife's name first before the husband's accompanied by the proper titles. For example: Dear Mrs. Thompson and Mr. Jones, (salutation on letter) Mrs. Susan Thompson and Mr. Jeremy Jones (address on envelope and letter) Note that you could use "Ms." instead of "Mrs." if you prefer, although I recommend that since in this example you know they are married I would choose "Mrs." Jim Lumley jimlumley@live.com
probabaly just a mrs. would suffise