A man gets sprayed with perfume by a salesman at work, and when he gets home, his wife thinks he's been with another women. He in turn finds some men's gloves and thinks she's been with another man. They look into a divorce, but decide to have a lawyer draw up a contract that will have them continue living together, communicating only through correspondence, but keeping up appearances their marriage is solid. This becomes particularly difficult when mother comes to visit, and they must also entertain guests. However, they do have a genuine love for each other, and it becomes increasingly difficult for them to remain mad at each other.
I think this could be considered an early screwball comedy, though it predates it as conventionally defined by twenty years.