Leave a message as unread on other computers if an email has been read on one computer

I need help with “read/unread status”, I have three computers with the pro version of emclient, the same email address is configured on all three, how do I set emclient to leave a message as unread on two computers if the email is read on another computer?
Right now if I read a message on one computer, it will also be shown as read on the other computers.
Thanks

If you have an IMAP, Exchange, Office 365 or iCloud (server based cloud account), if you read a message on one device then “all your other devices will also show read as soon as they sync / connect with the mail server” due to the nature of those type of server based cloud accounts.