The Postman by David Brin

In a post-apocalyptic America, where civilization has collapsed and survival is a daily struggle, a lone wanderer accidentally becomes a symbol of hope. Taking on the identity of a postal worker from the long-defunct United States Postal Service, he dons an old uniform and begins delivering mail, initially as a means to scavenge for food and shelter. However, his actions inspire others, and what starts as a deception evolves into a movement. The protagonist's journey transforms him into a leader who inadvertently unites disparate communities and reignites a sense of unity and purpose, becoming a catalyst for the reconstruction of society amidst the chaos and desolation of a fallen world. The 10431st greatest book of all time