"Good" mail that is. E-mail too. It makes me happy every time I have something fun in the mail box or in my in-box.
That's why I joined Postcrossing. Postcrossing is a place where you exchange postcards with people all over the world. I've sent cards to just about any country you can imagine & love receiving them. I may never get to travel to China or Denmark, but I love knowing that a little postcard can go there.
Since I'm a nerd I keep all of my postcards in little plastic sleeves in a binder. I am also a member of Swap-Bot & love to swap postcards & Artist Trading Cards (ATCs).
Swap-Bot you sign up for different kinds of swaps, depending on what you like, and then it matches you with swap partners.
ATC's are baseball card-sized works of art that you trade with other people. I love having cards from all over in my collection.
If you're interested in more "good" mail in your mailbox check out these 2 sites, it's a lot of fun.