If you want to send a message to your friend or any other player within your region, you can go to one of the mailboxes around Jorvik and click on it. A window will pop up, and you will be able to either choose one of your friends from your friend list or write the recipient’s name. Add a subject in the line below and type your message in the message field. Click on Send, and your mail is on its way!
Alternatively, you can send and check mail via the Star Stable Friends app. Click on the avatar icon at the bottom of the screen and then on the letter to open the mail function.
If you reach the limit of 50 messages, you won’t be able to receive any more mail, so make sure to empty your inbox from time to time!