are there a report on all email validation services to compare them?

We don't have a specific report comparing all email validation services. However, we offer flexibility in choosing email validation providers for our email waterfall feature. By default, we use ZeroBounce, which is a best-in-class validation service. But you can select a different provider if you prefer, especially if you know one that works better or is more cost-effective for your industry. Some of the email validation services we integrate with include: 1. ZeroBounce 2. BounceBan 3. Debounce 4. Emailable 5. Hunter Each of these services has its own strengths and may be more suitable for different use cases. If you need help choosing the best service for your needs, please let me know, and I can provide more information on their specific features.

Sources: Data points: Email Validity Status | Clay.com Enrich People (Waterfalls) [Clay 101] - Clay University