Anti-Fragile take
Validation is the step most teams skip and most regret. Enrichment gives you an email; validation tells you it will not bounce. We waterfall validators cheapest-first, escalating to premium verification only when needed.
Every contact entering outbound must pass validation or be flagged for manual review.
Why it matters
One bad send to a spam trap can burn a domain. Validation is insurance on your entire outbound infrastructure.
How we build it
Ordered validator chain, per-contact validation status, auto-exclusion from sequences on fail, and validation coverage dashboards.