ArcaMax Publishing distributes newsletters to 1.5 million subscribers daily and relies on advertising revenue. To maintain a healthy sender reputation and email deliverability, they use a double opt-in subscription process. However, some confirmation emails were still going to invalid addresses, negatively impacting their reputation. After testing LeadSpend's real-time email validation service, ArcaMax found 2-5% of new subscriptions from some sources had invalid addresses. Using LeadSpend helped ArcaMax prevent sending 1,000 confirmation emails daily to bad addresses, improving their deliverability and protecting advertising revenue.