Hi @Jianping Liu(刘剑平) ,
Welcome to our forum!
According to your description, i notice that you want to check the email content of other user's mailbox. What's your account?
1、I would like to ask, if the company uses Outlook mailboxes, can Outlook background check the history of employee emails, including email texts and attachments?
If you are using an Exchange account, when you are given the delegate access permission, you can access the other user's mailbox who is in your organization. More information: Allow someone else to manage your mail and calendar.
If you are using a Microsoft 365 account, as an administrator, please refer to: Give mailbox permissions to another Microsoft 365 user - Admin help.
2、If someone checks the email content of employees through the Outlook background, is there a log to check such behavior?
I'm afraid that the behavior cannot be recorded and there's no such log related to the behavior.
Hope the above help!
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