One of the functions of a mailbox is to receive/reply to good-faith messages, but 10,000 people can get together and decide to send postcards that say "YOU SUCK

One of the functions of a mailbox is to receive/reply to good-faith messages, but 10,000 people can get together and decide to send postcards that say "YOU SUCK." to a single recipient. That person's mailman might not be pleased, but all the mail is conveyed through legitimate channels and legitimate means...