Impressionwise is a data services provider specializing in real-time email verification and list cleaning services. Their solutions are designed to help marketers improve the deliverability and effectiveness of their email campaigns by removing problematic addresses and enhancing data integrity. Impressionwise's tools analyze, verify, and validate email lists to reduce bounce rates, avoid spam traps, and maintain compliance with email service providers' standards. The core features of their service include identifying hard bounces, spam traps, disposable domains, and harmful email addresses. Their services aim to protect sender reputation and improve email marketing performance by ensuring that users' email lists are clean and up-to-date.