Dear
Mr. (name) and Mrs (name)
The correct way to address an envelope to a married couple that have different last names is to use both of their names. For example, you could write Mr. Johnson and Miss or Ms. Dwyer.
"Mr. & Mrs. C. Smith" if you know his first initial. If not, then "Mr. & Mrs. Smith" would be correct.
Married or not , this person may be rightly addressed as Dr.
Address it as 'Pastor---(the name of the pastor).
Dr. [Husband's Full Name] and Dr. [Wife's Full Name]
In this wonderful modern age you can simply write her name on the envelope. It doesn't need to label her as married, unmarried, engaged, solo, etc. For example: If the person's name is Giselle Renoir and you want to invite her to a party then simply address the envelope to Giselle Renoir at her address. If you want to invite her husband too then simply address it to Giselle and Pierre Renoir.
Same as to anybody else. Put the name and address of the person clearly in the center of the envelope.
Say her name was Marjorie Jane Foster and her husband's name was Fred Arnold Smith - (Foster was her father's name):-When her husband was alive you would normally address her as Mrs. SmithWhen her husband dies most ladies keep their married name and continue to be known as Mrs. Smith.When you addressed the envelope you would send it to:Mrs. M.J. Smith
You may say to Signore & Signora or abbreviate it as Sr. & Sra.
You can address it to only one, or address it to both using both names. Either way is acceptable.
If you are using "Mrs.", you must use the husbands name: Mrs. Harold Happy NOT Mrs. Jane Happy If you don't know the husband's first name, then use: Ms. Jane Happy
* Senor & Senora ____________________. Senorita is single, Senora is married.