Sending mail through the postal system is fairly straight forward: you write the “to” address, your return address, throw on some stamps, and you’re good to go!
Ghost mail, however, is a bit trickier. Post offices around the world (for the living) are tightly integrated affairs run by technology and hard workers desperately fighting against bureaucrats. Netherworld mail is sorted by shadowy monsters, delivered by ghosts, and in general runs fairly smoothly.
Ensure your mail is properly sorted into this system with our Spectral Delivery sticker. For a smooth delivery, trust a ghost.