I am trying to simply send emails to people when a server or servers has low disk space on any Drive Letter inside the server. Here is my picture and it is not working. My goal is to literally email bomb these server owners till they fix the issue.
You need to separate all of those servers. Your logic is incorrect.
Unless of course the alert is meant for ALL servers in one poll with low space and not just 1 of your group you have listed.
Make the alert an All (AND) and put your Node names in the OR condition.
