The Monday motivator goes out to all persons evaluated in the past 4 weeks or those who have waiting evaluations or projects at risk.
If you have not been evaluated in a while, encourage your manager to leave you feedback soon.
You might also want to check your notifications to ensure you have not stopped them accidentally. Hover the mouse over your name in the top right of the screen and click on the Notifications option. You can configure how you receive notifications from here.