Stop bounces before they cost you your sending domain

The problem

What goes wrong without email verification

Even a clean list decays at 2–3% per month as people leave jobs, abandon addresses, or get mailboxes deprovisioned. A segment untouched for six months may have a 15%+ hard-bounce rate waiting to detonate.

Email service providers — Gmail, Yahoo, Outlook — now enforce strict sender reputation thresholds. Exceed 0.3% spam complaint rate or 5% hard-bounce rate and you're in a suppression loop that takes months of careful sending to escape.

Re-engagement campaigns targeting dormant subscribers are a bounce spike waiting to happen. Addresses that haven't opened in 12+ months are disproportionately likely to be recycled as spam traps by inbox providers.

The solution

How emailzeno solves it

emailzeno runs a five-layer verification pipeline — syntax, disposable-domain check, role-address flag, MX reachability, and live SMTP handshake — to give every address a human-readable verdict before you send, sync, or onboard.

Read the API docs

Pre-flight verification workflow: Schedule a batch job against your full active segment. Export the CSV from your ESP, upload to emailzeno, receive results, suppress the failures before your campaign fires.

Spam-trap detection heuristics: Our engine cross-references known recycled spam trap patterns and dormant-address signals. No system catches every trap, but we flag the statistical high-risk addresses that correlate with blacklisting events.

Incremental list health scoring: Run monthly verification sweeps and track your deliverability health score over time. Catch decay trends before they become campaign disasters — not after.

See it in action

Integration in under 5 minutes

Export CSV

Pull contact list from your CRM or ESP as a CSV file.

Upload to emailzeno

Drag-and-drop or POST via API. Results stream back as workers complete.

Download results

Scored CSV with ec_status + ec_risk_score columns ready to re-import.

Suppress & send

Filter undeliverables from your segment, then campaign with confidence.

Pre-send hygiene in 3 steps: export CSV from your ESP → upload to emailzeno → re-import suppression list.

By the numbers

Why senders trust emailzeno

Accuracy isn't a marketing number — it's validated against live SMTP handshakes and independently confirmed by customers running monthly deliverability audits.

<2%

Bounce rate target

99.6%

Verification accuracy

−35%

Avg bounce reduction

30 days

Results retention

Integrations

Works with the tools Email Marketer already uses

Export from any platform, verify with emailzeno, and re-import the scored list — or connect via REST API, Zapier, or Make to automate the workflow entirely.

Mailchimp

Klaviyo

Campaign Monitor

ActiveCampaign

Brevo

Browse all integrations

Start verifying free — no credit card

Protect your domain reputation. 300 verifications free to start.

Get started free View pricing

FAQ

Email Marketer — common questions

For high-frequency senders (weekly), run a full sweep monthly and verify any new segments before first send. For lower-frequency senders (monthly campaigns), verify the full active segment before each campaign. The cost of verification is a fraction of the cost of a deliverability incident.

Short term, yes — your sendable list shrinks slightly. But your engagement rate rises because you're only mailing addresses that can actually receive mail. ESP algorithms reward engaged audiences with better inbox placement, so your reach to real humans actually improves.

We flag statistical high-risk addresses using proprietary heuristics trained on verified spam-trap patterns. We don't maintain an inbox-seed network, so we can't guarantee detection of every trap — no verification vendor can. The combination of SMTP probing + age signals + domain reputation scores catches the vast majority.