It was suggested by a user of one of my mods that it would be nice to be able to move the farm's mailbox to somewhere else on the farm.
This mod removes the mailbox from the farm map and adds a moveable mailbox in its place. The new mailbox is a craftable object like any other, just remove it with a pickaxe and put it where ever you like. Waiting mail is not lost when you move the mailbox, but you won't be able to check your mail until you place it again.
You can craft and place multiple mailboxes, but only the last mailbox placed will be recognized as your mailbox.
Also, if you are using a custom farm texture for your farm, you can have this mod copy the mailbox from that texture, overwriting the default moveable mailbox texture. Just set CustomMailbox to true in the config.json. Hopefully this works as expected.
Also check out Moveable Pet Bowl.
Technical
Requires SMAPI and JSON Assets, uses Harmony.
Compatible with Mod Updater for automatic updates.
Code is at https://github.com/aedenthorn/StardewValleyMods.
If you want to complain or ask for help or help me test my mods, you can visit my Discord server.
A list of all my mods for Stardew Valley is available at https://www.nexusmods.com/stardewvalley/articles/895.
