Secret revealed why some envelopes delivered with letter P handwritten on them. Perplexed recipient of letter with handwritten markings took to Reddit to discover the reason behind it.

Here's what to know on how to address an envelope, write a return address, find a zip code, send letters internationally and figure out which stamps are best.

A 165-year-old envelope addressed to one of the Victorian era’s greatest writers has been reunited with its letter, unexpectedly discovered by an American academic. The items, dated 8 November 1848 ...