Create an alert for an unread email from a maibox

Hi,

I would like to ask help on how to create an Icinga alert for our unread emails. We have SLA an of 1 hr for any emails we receive in our mailbox. Can you help me configure it? Thanks!

Icinga Web 2 Version 2.8.2
PHP Version 7.2.24-0ubuntu0.18.04.7