"Mail delivery failed.." stop mails to root

If you use the search feature in the forums, you will find several threads about this. For example:
How to stop Mail delivery failed: returning message to sender

I think it's best to address the issue at it's source(i.e. find the source of the bounces); however, you could do a custom filter:
How to Customize the Exim System Filter File - cPanel Knowledge Base - cPanel Documentation

 

My apologies, I meant to link the following:
"Mail Delivery Failed" messages in my inbox

As I said, I think it's best to address the issue at the source, but you can create a custom filter for them.