Create a missing values LIST after using the "find missing value" function.

Create a missing values LIST after using the "find missing value" function.

Zoho sheets data cleaning does a great job of finding missing values function when comparing two columns.
But then it wants to fill in the columns that are missing.
What I want to do is create a LIST of the missing values in a separate column. Make sense?

I have a master email list. I receive emails from accounts on this list, but often there are missing emails.
I want to generate a list of the missing emails. Make sense? 

I'm using the fine missing values function, and first, it's not working. the missing email address is zoe@zohomail.com (see the screenshots), and second, it's designed to fill in the missing values but I want to create a missing values list. HELP!

Thank you!