Assign eDiscovery permissions in Exchange 2016 https://technet.microsoft.com/en-us/library/dd298059(v=exchg.160).aspx
2）然后执行命令进行批删查询
Create an In-Place eDiscovery search in Exchange 2016 https://technet.microsoft.com/en-us/library/dd353189(v=exchg.160).aspx
3）确认无误后，批删邮件
Search for and delete messages in Exchange 2016 https://technet.microsoft.com/en-us/library/ff459253(v=exchg.160).aspx
备注：10000个邮箱以下的组织，exchange 2016下还可以继续使用search-mailbox进行删除。
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Exchange 2016通过New-mailboxSearch批量删邮件
原文：https://blog.51cto.com/543925535/2366507