The Shop Around the Corner (1940)
"Matuschek's" is the gift shop around the corner. Among the staff is Alfred Kralik, a likeable young man who's in love with a woman he has never met and whose name he doesn't even know (their "romance" has been conducted through a post office box). When Klara Novak comes to work as a clerk in the shop, the sparks begin to fly: she and Alfred can't stand each other. Of course, what neither knows is that Klara is the woman Alfred has been romancing through the mail!