The GTM Provider Directory
Waterfall & Workflow

How does the email validation waterfall process actually work?

April 2026

Quick Answer

## Email Validation Waterfall Process ### Key Characteristics - Stops validation process as soon as a valid email is found - Multiple providers only run when previous email validation is invalid - Default provider: **ZeroBounce**, known for high accuracy ### Validation Flow 1. First validation provider checks email 2. If email is invalid, move to next provider 3. Process continues until valid email is confirmed ### Provider Selection - Default: **ZeroBounce** - Can be customized based on industry-specific validation needs - Recommended: Choose provider with highest accuracy for your domain

○
Up to date
1 months ago

1 Answer

Email Validation Waterfall Process

Key Characteristics

  • Stops validation process as soon as a valid email is found
  • Multiple providers only run when previous email validation is invalid
  • Default provider: ZeroBounce, known for high accuracy

Validation Flow

  1. First validation provider checks email
  2. If email is invalid, move to next provider
  3. Process continues until valid email is confirmed

Provider Selection

  • Default: ZeroBounce
  • Can be customized based on industry-specific validation needs
  • Recommended: Choose provider with highest accuracy for your domain

Important Notes

  • Low risk of false negatives
  • Single validation step determines final email status

[Learn more about email validation](https://www.clay.com/university/lesson/enrich-people-waterfalls-clay-101?3ad0eecb_page=

GTM StackCommunity Insight