Hi there,
I think setting up a new alert profile will do what you want. An alert profile is a way for you to say to Delphix "Whenever an alert like X happens, please email Y".
This is something that you would need to do via the CLI interface, rather than the GUI. The exact commands you'd need to type will vary depending on the version of Delphix you are running. Here is the documentation for version 5.0:
https://docs.delphix.com/display/DOCS50/Email+%28SMTP%29+Alerts#Email(SMTP)Alerts-AlertProfilesThe gist of this is that you need to:
1) Create a new profile
2) Set the "action" on the profile so that it sends email to the addresses you want.
3) Set the "filters" on the profile so that the profile matches only the alerts you care about.
In your case, it sounds like you are only interested in certain types of alerts. This would mean you'd want to set up an "event filter" (and not a "severity filter" or a "target filter")
It also sounds like you only care about alerts generated by system faults related to usage levels. So, I think "fault.system.usage.*" would be a good match string to put in your event filter.