@interface Message.MailboxPersistenceHelper : _TtCs12_SwiftObject {
    void /* unknown type, empty encoding */ mailbox;
    void /* unknown type, empty encoding */ mailboxURL;
    void /* unknown type, empty encoding */ account;
    void /* unknown type, empty encoding */ store;
    void /* unknown type, empty encoding */ serverMessagePersistence;
    void /* unknown type, empty encoding */ messageChangeManager;
    void /* unknown type, empty encoding */ mimeCache;
    void /* unknown type, empty encoding */ logger;
}

@end