Keep a sensor in alert state untill acknowledged

Is it possible to keep a sensor in a specific state untill I acknowledge the state?

Example: I check a mailbox with the MAPI sensor and an alert will be raised if the subject contains the string "error". The check is done every minute.

Now, if the condition is true, I indeed receive an alarm, but after a minute, the sensor is green again. How to keep it in alarm state?

acknowledge mapi state