Desciption
Quark adds a variety of wooden chests of different types and colors depending on the wood used to make them. The issue being, Quark makes the standard wooden chest from Minecraft uncraftable to achieve this effect.

Since the Mailbox's recipe accepts only the standard MC chest (and not any forge-tagged wooden chest) the combination makes mailboxes uncraftable.

MC 1.16.4 - Furniture 7.0.0 pre19
Forge 3.1.15 - Quark 2.4-275