False alarm people I’ve figured it out. Walking high heels takes practice, the guy tripped and fell. He is dead and he dreams of being a girl. Being dead is the most suitable form of existence.
@Vicic the rainwater was dripping from soaked mailman as it leaned over to read the note.
Sci-fi has decades of rules for preventing time paradoxes, telling someone of their future is one of them. The mailman was following these rules.