You have a customer list, it’s yours, you collected all the names. You’ve used it several times for marketing in the past. Recently you used it again. Some of your email messages came back because the addresses are invalid. You want to send out another campaign but there’s only so much time you have to compose new content and get out a mailing. Having over 29% invalid email addresses is so disappointing. You do not have time for sanity checks; After all how many people leave out the @com on their Gmail address, or forget about that little dot between it. Besides, this is an older list, and you believe all those addresses worked before? Instead of deleting all those bounces, 29% of them.: Does it make sense to trust an email verification service? If you think about it, your member list, ideally, collected by you, is comprised of subscribers who are opted into your list. All those addresses should be deliverable