Searching for text in system messages in Outlook returned from Exchange

Question

I am trying to search returned error messages I get from Exchange. Somehow, Outlook does not return any results.

When I preview the messages I only see

Your message did not reach some of all of the intended recipients. Open the message to see additional details.

Only when I open the message I see the error text in full

Here's a line from a typical error message (specifics removed to protect the innocent)

example.org.il #5.7.1 smtp;554 5.7.1 unknown[192.118.1.100]: Client host rejected: Access denied

Is there a way to search inside those messages?

Can it be done from within outlook or should I use an external tool?

Thanks!