Animal crossing can't send mail to friends

I think there may be some confusion here!

In Animal Crossing, you can indeed send mail to your friends, but there are some limitations and requirements to keep in mind:

1. Friendship level: You need to have a certain level of friendship with the player you want to send mail to. The friendship level is determined by the number of gifts you've exchanged with each other. You can increase your friendship level by sending and receiving gifts, participating in activities together, and completing tasks for each other.
2. Mailbox capacity: Each player has a limited mailbox capacity, which means you can only store a certain number of letters, photos, and other items in your mailbox. If your mailbox is full, you won't be able to send any more mail until you clear out some space.
3. Mail delivery: Mail is delivered to your friends' mailboxes in real-time, but it may take a few minutes for the mail to arrive. You can check your friends' mailboxes by visiting their homes or by using the "Visit" feature in the game's menu.
4. No online multiplayer: Unfortunately, Animal Crossing does not have online multiplayer capabilities, which means you can't send mail to friends who are not playing on the same console or device as you.

If you're having trouble sending mail to friends, make sure you've met the friendship level requirement, have enough space in your mailbox, and that your friends are online and available to receive mail.