The purchase of email lists is completely forbidden! since not all of these email addresses have been validated and are interested in your brand. If your subscribers are not opening your emails, the email list is useless. Your email campaigning efforts are pointless if subscribers aren’t actively engaging with your emails or aren’t interested. You may increase the size of your own opt-in email list in a number of ways. When people visit your website, you must request their email addresses in exchange for a deliverable like an e-book, whitepaper, etc.