I’m a marketer having debate with product manager (both work for popup tool).

The debate: validate emails (typo checks, ZeroBounce/Bouncer integrations) right at contact capture, or clean the list after signup?

I’m firmly in the “after” camp. Adding friction during signup = direct conversion loss when you’re fighting for every lead. Brands shouldn’t pay that “conversion tax” just to fix deliverability problems.

At Claspo, users keep asking for these quality gates upfront because they hate bounces later. Demand’s real. But basic hygiene shouldn’t kill signup rates — ESPs should handle more of the infrastructure responsibility (IP reputation, inbox placement).

Where do you validate and why? Signup friction worth it, or clean post-capture?