You can modify the email template using the API (check out the commands in https:///suite-api ). It's not as simple as it once was int he past with 5.x. where you could tweak some XML of a file and call it good.
Use the URL for your vROps server and append /suite-api. https://<your vROps address>/suite-api
The API is helpful, but somewhat lacking. This KB article does a good job walking through the process, but unfortunately it is also missing some info.
In step 5 of the KB article when you create the email condition you need to add an "emailAddress" to the request. This is the email address you want the notification sent to. So it should look something like this:
curl -k -X POST -i -H "X-vRealizeOps-API-use-unsupported: true" -H "Content-Type: application/xml" -u admin -d "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"yes\"?>
I've had a support ticket open for this for quite a while and we just got it working last week. So hopefully this helps!