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If you know the name of the husband, it is proper etiquette to address the mailing envelope to "Mr. and Mrs. [his name here]". On the inner envelope the addressing can be much more informal, with a simple "John and Jane", etc.Another PerspectiveThis is the twenty first century. Women have names and an existence apart from their husbands. An invitation can be addressed to Margaret and William Anderson. Most etiquette books are decades behind the times.
Mr. John Doe & Dr. Mary Smith (or the reverse, depending on priority re content)
Addressing a husband and wife who are both Reverends: Reverends John & Jane Doe.
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.
* Informally means casual so you would address a husband and wife by their first names. Formally is when you would use Mr. Doe or Mrs. Doe.
You can address it to only one, or address it to both using both names. Either way is acceptable.
With their names and the address. Ms. Jane Hope and Ms. Marie Faith OR Jane Hope and Marie Faith
You can address it: John Doe and Jane Smith Street Address City, State, zip code
male
Nabal
When you want to address an envelope using both Christian names of the couple you would write it as: Mr. John Doe & Mrs. Jane Doe (example.)
I am fairly certain that you would address the letter by listing the names alphabetically on separate lines on the envelope, and then follow with the address. Example: Mr. John Jones Mrs. Jane Smith 200 Nowhere Lane Anyplace, State 00000-0000 It is handled differently if one of the individuals has a title (such as a doctor)...but, I can't remember the rule for that one.