How to concatenate variables in an Email action?
There are 2 ways to do it:
1. Create a 'Severity Level Variable' in the rule which contains the variables which you want to concatenate. In the Email action the variable can be accessed.
2. Create a 'User Defined Parameter' in the Email action itself in which the variables can be concatenated.
Attached a short instruction how to do the set up for both ways.