How do you send mail to friends in animal crossing

In Animal Crossing, you can send mail to your friends by using the in-game postal service. Here's how:

1. First, you need to have a friend who is also playing Animal Crossing. You can invite friends to play with you online or visit their town in person.
2. Once you have a friend, you can send them a letter by going to the post office in your town. The post office is usually located in the center of the town, and it's marked with a mailbox icon on your map.
3. Inside the post office, you'll see a counter where you can send mail. Click on the counter to open the mail menu.
4. In the mail menu, you can choose to send a letter to a specific friend. You can select their name from the list of friends you have in your address book.
5. Once you've selected the recipient, you can write a message in the text box. You can type up to 100 characters in the message.
6. After you've written your message, you can choose to send the letter. The letter will be delivered to your friend's mailbox in their town.
7. Your friend can then read the letter and respond to it by sending a letter back to you. You can receive letters from your friends by checking your mailbox in your town.

Note that you can only send letters to friends who are also playing Animal Crossing. You can't send letters to non-players or to people who aren't playing the game.