MailCracker is an independent email infrastructure and deliverability platform created for marketers, outbound teams, and technical administrators. The company is based in Europe and focused on helping businesses improve email performance, avoid spam folders, and protect sender reputation. MailCracker.Pro is a browser-based tool that allows users to test email deliverability, detect spam triggers, and validate core DNS records such as SPF, DKIM, DMARC, and rDNS. Users can check inbox placement across major providers including Gmail, Outlook, Yahoo, and iCloud without requiring integrations or setup. The platform is built for professionals who manage email marketing, transactional messaging, or cold outreach. It is especially useful for teams working with dedicated SMTP servers or custom domains. Reports include detailed analysis of delivery outcomes, IP reputation, and domain-level configurations. A free plan is available with no registration required for the first three spam checks. MailCracker.Pro is hosted in the EU, supports data deletion by request, and is designed to comply with global deliverability and privacy standards.