Your Mailbox stores rewards from daily logins, Kingdom Tasks, purchases, special events and other rewards in the game.
You can access your mail by selecting the mail button at the top of the screen.
Select the mail you wish to view, then collect any rewards shown by selecting the Collect button.
You can collect all mail at once and see a summary of the total mail rewards by selecting the Collect All button at the top right corner of your Mailbox.
All mail has an expiry date which you can check on the top right-hand side of the mail. Mail expires 28 days after it's received in your inbox.
There is currently no mailbox limit.