If you have the CommonStore single-instance-storage (SIS) algorithm activated, make sure that all mails are different and not yet stored in the repository.
如果激活了commonstore单实例存储(single - instance - storage,SIS)算法，那么应确保所有邮件各不相同，并且没有存储在储存库中。
If you have the CommonStore single-instance-storage (SIS) algorithm activated, make sure that all mails are different and not yet stored in the repository.
如果激活了commonstore单实例存储(single - instance - storage,SIS)算法，那么应确保所有邮件各不相同，并且没有存储在储存库中。
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