# Constants
END_MAIL_ID is the max possible Mail ID.
# Structs
Account entity for login process.
Avatar entity which is the player itself.
MailService to handle mail sending & receiving.
Monster type.
MySpace is the custom space type.
OnlineService is the service entity for maintain total online avatar infos.
SpaceService is the service entity for space management.
# Type aliases
MailData is the type of mail data.