You could address it to Reverend and Reverend Smith. The alternative would be the Reverends Smith.
Mr and Mrs would be proper. Attorneys are typical written to as Mister.
Dear Mr. John and Rev. Sally Smith,
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
Dr. and Mr. Smith
Dear Counselors:
To whom it may concern
Rabbi and Mrs.
The proper salutation for a letter addressed to a husband and wife who are both attorneys would be "Dear Mr. and Mrs. [Last Name]" or "Dear [First Name] and [First Name] [Last Name]." If you want to acknowledge their professional titles, you could use "Dear Attorneys [Last Name]." This conveys both respect for their professional status and addresses them as a couple.
A proper salutation for greeting the president of a business is "Dear Mr. President". To conclude a letter, the proper word is "Sincerely" and a the name of the writer.
"Dear" is what people use it nowadays.
Dear Mrs Ambassador..
yes