The term "Mailbox" (Flash component) is often used to refer to the user interface for the Mail system, or in reference to the system itself. Users use it to send and obtain mail within My LEGO Network.
Users can have up to 30 messages in their mailbox at one time. When that capacity is filled, users will be asked to delete as many messages as possible.
Users can attach Mailable items to any message. Users can only attach one type of mailable item in a message but they can attach as many as they want (and possess).