Ok this isn't really anything that can be done IN linksSQL, but its related =)

I want to take all e-mails from the users and links and compare it with a list of e-mails i have, each email is on a new line. I know how to get all the e-mails from the database, what I need to do is compare the e-mails from list 1 and IF they exist in list 2, delete them from list 2. Any ideas?