The Star mail is the fortune/luck of your tamagotchi. The Gotchi points bag icon means the chance of the King stopping by in the enevlope box. The Heart icon means the chance of your tamagotchi making love on the next connection and the MAN icon means the chance of your tamagotchi getting sick.
The Envelope = Regular mail that your tamagotchi gets poop, king stopping by, snakes, hearts, and etc..
[!] = Important Info for your tamagotchi school and jobs.
Regular:
Snake = Sometimes drop your tamagotchi HAPPY hearts down.
Poop = The same as Snake
Heart = Making your tamagotchi HAPPY hearts go up.
King = Gives you presents, money, and toys.