In Three Husbands, a troublemaker's letters to three men claim that he has had affairs with their wives. If the plot sounds familiar, it is—A Letter to Three Wives (1949) with a gender flip and the same screenwriter: Vera Caspary, the author of Laura. With additional screenwriting assistance by songwriter Edward Eliscu, the film was produced by I. G. Goldsmith, Caspary's husband, and directed by Irving Reis (director of The Bachelor and the Bobby-Soxer; some of the Falcon films with George Sanders; Enchantment). Its stars include Eve Arden, Howard da Silva, Ruth Warrick, and Vanessa Brown.
(Hat tip to Caspary scholar A. B. Emrys for bringing this film to my attention)