How to enrich leads from several sources in order
Enrich in a waterfall: try the cheap source first, then the next, and stop when you have what you need.

One data source never has everyone. A waterfall fills the gaps without paying twice.
How a waterfall works
- Start with the cheapest or most accurate source.
- If it finds nothing, try the next one.
- Stop as soon as a result is found.
- Check the result before you send.
Verify at the end
Verify emails before you send, no matter where they came from.
If you want the step by step: Read The Enrichment Waterfall.
