The Mail System was implented with Episode 10.4. Now Players could send messages to other Players.
For send a meesage to an other Player you have to talk with the Mail Box Npc. The Mail Box NPC is located in every city, for a few of 130 Zeny you can send a message.
You can have a maximum of 30 messages at once.
Zeny and one Item can be sent with the Mailing System
Messages to characters on the same account cannot be send