Clay S. which vendor for waterfall is best to get valid emails

By default, we use ZeroBounce for email validation in our waterfall process. It's considered a best-in-class validation service. However, you have the flexibility to choose a different provider if you prefer, especially if you know another provider validates best or is more cost-effective in your industry. The best vendor ultimately depends on your specific needs and the nature of your data.

Sources: Enrich People (Waterfalls) [Clay 101] - Clay University Enrich People (Waterfalls) [Automated Outbound] - Clay University

If you're experiencing issues with Apollo returning "invalid input" errors, here are some steps to help you get correct and valid emails: 1. First, try refreshing your browser (Cmd/Ctrl + Shift + R) to ensure you're using the latest version of our app. 2. For Apollo specifically, use the "Find People at Company By Job Title" feature to identify the right people, then use the "write each item to new row in other table" function in Clay to extract results. 3. In the new table, use the "Enrich Person From Apollo" function. Map all necessary columns except the email, then run the enrichment. This should provide the saved contact's email address. 4. If you're still having trouble, consider using our email waterfall feature. It uses multiple providers to find and validate emails, increasing your chances of getting correct addresses. If you need further assistance, please request human support by clicking on "Talk to a person".

Sources: Enrich People (Waterfalls) [Clay 101] - Clay University [FAQ: Why am I seeing email_not_unlocked@domain.com in Apollo?](https://docs.clay.com/en/articles/9757360-faq-why-am-i-seeing-email%5Fnot%5Funlocked-domain-com-in-apollo)

Hey Maria, thanks for reaching out! Would suggesting using our work email waterfall which combines various data providers allowing you to get the most coverage as possible. When it comes to data providers trying to choose a single one that is "the best" can be super difficult as they can specialize in various regions, or types of data. That's why we recommend the waterfall system which will try to find an email at the first data provider, if one is not found, it will move on to the second one. Check out more info on waterfalls here. Let me know how else I can assist!