exchange 2016中通过共享邮箱发送的邮件，不会保存到共享邮箱的已发送邮件文件夹中，而是会保存到用户自己的已发送邮件文件夹。
解决的方法
通过设置共享邮箱的两个属性，将已发送邮件保存一份副本到共享邮箱的已发送邮件文件夹中，如图。
官方参考链接
Want more control over Sent Items when using shared mailboxes? – You Had Me At EHLO… https://blogs.technet.microsoft.com/exchange/2015/03/03/want-more-control-over-sent-items-when-using-shared-mailboxes/
Messages sent from a shared mailbox aren't saved to the Sent Items folder of the shared mailbox in Outlook https://support.microsoft.com/en-us/help/2843677/messages-sent-from-a-shared-mailbox-aren-t-saved-to-the-sent-items-fol
原文：http://blog.51cto.com/543925535/2056680