It's possible you are thinking of one of these:
* "The Missing Mail" is a short story by Somerset Maugham. It's a poignant tale about a man who receives a letter from his long-lost love after her death.
* R.K. Narayan is known for stories like "The Guide, Swami and Friends, The Financial Expert, Waiting for the Mahatma, The Bachelor of Arts, and The Man-Eater of Malgudi." He wrote about everyday life in the fictional town of Malgudi.
Perhaps you can provide more context about the "Missing Mail" story you are looking for, like:
* Where did you hear about it? (a book, a website, a movie, etc.)
* What is the story about? (a brief summary)
* Who are the characters?
With more information, I might be able to help you find the specific work you are looking for.