How to check when was email marked as read

[duplico.online]

Hi all,

is it possible to check time and date when was an email message marked as read by user?

Thanks.

[Raun]

there is no way for the end user to know this. The admin who has access to server can know.

[duplico.online]

Well, i am asking from an admin side.
How can I as admin, get to this data?