Digging through some of my old forum posts, I found this:
There are actually options you can add for exim configuration in the WHM > Exim Configuration > Advanced Editor area in the topmost box that would either reduce, suspend or control connections when the machine has a high load. I
	
			
			There are actually options you can add for exim configuration in the WHM > Exim Configuration > Advanced Editor area in the topmost box that would either reduce, suspend or control connections when the machine has a high load. I
 
				 
 
		