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Marketing Ops

Clean 10 million emails before your next send

Upload any size list. EmailZeno removes hard-bounce traps, role addresses, and catch-all dead-ends in minutes — not days.

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The problem

What goes wrong without email verification

A stale list silently destroys sender reputation — every hard bounce is a vote against your IP with inbox providers.

Manual list hygiene at scale is a spreadsheet nightmare: VLOOKUP deduplication misses syntax variants, disposable domains slip through, and you never know which addresses are true catch-alls.

Purchasing a new segment or migrating CRMs dumps hundreds of thousands of unverified contacts into your ESP — one bad campaign warms up a blacklist you can't easily escape.

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
Parallel batch engine: Multi-worker SMTP probing processes up to 10 M rows. No "queue later" limbo — results stream back as workers complete each domain group.
Five-layer verdict stack: syntax → disposable domain → role-flag (noreply@, admin@) → MX reachability → SMTP RCPT TO handshake. Every address gets a human-readable disposition code, not just pass/fail.
Catch-all scoring: We probe catch-all domains with a canary address pattern to estimate deliverability probability, so you can choose your own risk threshold rather than blindly keeping or dropping every catch-all.

See it in action

Integration in under 5 minutes

Drop your CSV → get results back

Columns: email (required), optional name / id passthrough columns. Output appends: ec_status, ec_risk_score, ec_did_you_mean, ec_verified_at.

deliverable undeliverable risky catch-all unknown

Drop a CSV → receive a scored list with status codes (deliverable / undeliverable / risky / catch-all / unknown).

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.

99.6%
Accuracy
10 M+
Rows per batch
< 5 ms
API response (single)
100%
Credit refund on hard bounces

Integrations

Works with the tools Marketing Ops 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.

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Start verifying free — no credit card

First 300 verifications free. No credit card. Results in minutes.

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FAQ

Marketing Ops — common questions

Typical throughput is 100 k–300 k verifications per hour depending on recipient domain throttling policies. A 1 M list completes in 3–10 hours. You'll receive a webhook notification when the job finishes and can download results immediately.

Raw addresses are retained for 30 days to support result downloads, then purged from EU-hosted infrastructure. You can trigger immediate deletion via the API. We never share list data with third parties.

"Catch-all" means the mail server accepts any address at that domain — we can confirm the domain is live but can't verify the specific mailbox. "Unknown" means the server timed out or refused our probe; the address may exist but couldn't be confirmed. We recommend treating both as medium-risk and segmenting them into a lower-send-frequency cohort.
Free forever — no credit card

Clean lists ship faster.
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300 verifications /mo · five-minute API integration · credit refund on hard bounces. Trusted by senders who treat sender reputation like the asset it is.

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