How a LATAM debt-negotiation platform protected its Gmail sender reputation
Email powered onboarding, account updates, and reminders for millions of borrowers. Real-time verification at signup kept the list clean before deliverability could slip.
Persona: A LATAM consumer-finance platform
What was breaking
Free-mail providers tightened sender requirements just as the team scaled paid acquisition. Typos and dead inboxes were entering the list at signup and quietly degrading inbox placement on the biggest provider. The marketing team did not have a way to distinguish a healthy registration from one that would bounce on the welcome email a day later.
How emailzeno fit the workflow
They wired the emailzeno verification API into the registration form, calling it on submit. Deliverable addresses passed through normally; undeliverable and high-risk addresses were rejected at the source with a typo suggestion shown back to the user. A nightly re-verification pass swept the existing CRM segment that predated the integration.
What changed
Hard-bounce rate on the welcome sequence dropped sharply within the first month. Gmail complaint rates stayed under threshold through a doubling of registration volume. Engagement on lifecycle campaigns climbed because campaigns reached real inboxes instead of placeholder addresses.
“Inbox placement on the major free-mail providers is no longer a quarterly fire drill — verification at the source removed the problem upstream.”
The emailzeno building blocks
Real-time API at signup
Single-address endpoint with sub-300 ms response on the 95th percentile — fast enough to block on form submit without UX cost.
Typo recovery
When a recognisable domain is misspelled, the API returns a did_you_mean suggestion the form can offer as one-click correction.
Sender-reputation friendly
Pre-send hygiene keeps your free-mail complaint rate inside provider thresholds — the difference between Promotions and the spam folder.
Questions teams ask before adopting
Run the same play.
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