Naufragio
One woman lives waiting for her son who is a sailor. She hasn't seen him for years although he writes to her a lot. The woman shares the letters and her grief with a co-worker and friend. This last woman begins to idealize her friend's son.
Starring José Alonso, María Rojo, Ana Ofelia Murguía, Carlos Castañón, Guillermo Gil, Manuel Ojeda, Martha Navarro, Blanca Torres, Farnesio de Bernal, Emma Roldán
Watch "Naufragio" on Mubi released in 1978. It's a drama movie, and has a rating of 6.9 out of 10 from Imdb which is usually fine for this kind of movie.