I very rarely get anything through the mail, and if I do it tends to not be things I'm grateful for (council bill increases, speeding/parking fines etc )
1. Christmas/birthday cards - getting older and more digital has led to a reduction in cards being sent through traditional mail, but it's still nice to receive them when they arrive.
2. Online deliveries - the bulk of my mail tends to be made up of whatever things I've been ordering online. Usually stuff i dont need but enjoy nevertheless!
3. Refunds - doesn't happy too often but its always nice to receive unexpected refunds like on income tax, car tax etc.