1. I use GetInboxItem to return information, some item return succeed, others item return nil。

    I use GetInboxItem to return information, some item return succeed, others item return nil。

    I use GetInboxItem to return information, some item return succeed, others item return nil。

    Are you manually querying the items?  Is the mail window open when you are querying?  Have you made sure to wait for the MAIL_INBOX_UPDATE?