This strikes me as an odd sentence. Does Neha collect old letters? Does she comb thrift stores and estate sales looking for others' old correspondence? If so, cool :) Everyone's got their own hobbies. But this is what I'm picturing, anyway.
This is a sentence for the older members who remember days in India when you bought an Airmail letter which included the stamp from the P.O. which enabled you to write that long overdue letter back home.