I have two Excel lists. One master list (list A) contains all our email addresses from our customers. The other list (list B) contains a list of people who do NOT want to recieve emails. How do I take the emails from list B (there are 1,200 of them) and compare them automatically to list A? Basically if any email address from list B appears in list A, I want it to delete in list A.

is that possible?

thank you