Hello! I am looking to purchase a email list of about 10,000 for a specific niche. When I do match up with a seller, how can I go about verifying that their list is real, has the open rate they are advertising, and the CTR rate they are advertising? I notice that people send these screen shots, but how do I know the actual emails in that list from the screen shot are the ones they are sending me? Is there a way I can ask for a quick test, list randomly have them select a couple hundred addresses and do a test run? THANKS in advance!