If you don’t want any more email updates from the USPS informed service then you can deactivate the service by applying these steps.
Open the website login page and enter your email and password.
After login move to the settings of the informed login dashboard.
Under daily mail updates turn off the mail updates settings.
Confirm the settings and you are done.
Read more about USPS: https://ityug247.com/informed-delivery-login/