ThunderDataVerify is a simple, easy-to-use, and accurate email verification software. You can verify a list of email addresses whether they exist or not without having to send an email. Your computer or its IP address is not used. It’s all done through our cloud-based online software. Just click through to our control panel, upload your mailing list, and our system will produce the results almost instantaneously. It really is that simple. Apart from this, we have millions of spam-trap and complainer databases. This allows us to check whether there is a match between your mailing list and our databases. If there is, we will mark it as a bad address.