Don't burn your domain on dead mailboxes.
SMTP mailbox probes for cold outreach and signup forms. Catch-alls stay scored, every failure gets a reason, and Unknown credits are refunded.
Verify an email right now
No signup. Real SMTP probe. 3 of 3 free verifications left.
Why most verifiers cost you sends
They paint catch-alls Valid, hide the reason, and charge you when they don't know.
The 
Advantage
Everything you wished your current email verifier could do.
We Don't Guess Valid
Unknown means the provider withheld a definitive answer — not that the address is bad. We refuse to guess (protecting your reputation) and refund those credits automatically.
Clear Failure Explanations
Reason codes per email: syntax, blocked, greylisted, temp fail—no guessing.
Real-time Bulk Progress
Live progress, ETA, and logs for every job.
Honest Catch-all Scoring
Catch-alls stay Risky with provider-graded confidence — we won't mark them Valid to inflate your list.
Built for Large CSVs
Stable uploads + resilient processing for big lists, with safe catch-all export presets.
Zero-Storage Privacy
Processed for verification, then auto-deleted after your export window—not kept in permanent history.
Ready to experience the difference? See it in action
Built for operators who need elite accuracy
MillionVerifier wins on raw price. ZeroBounce wins on enrichment. We win on honest classification, Unknown refunds, and privacy.
Unknown / inconclusive results refunded
Provider-graded catch-all confidence scores
Catch-alls stay Risky — never inflated to Valid
Zero-storage privacy mode (auto-purge)
Scheduled re-verify of completed bulk lists
Live bulk progress with ETA (SignalR)
Transparent SMTP reason codes & telemetry
Resilient large CSV bulk processing
Activity / engagement enrichment data
| Capability | Nexiphor | MillionVerifier | ZeroBounce |
|---|---|---|---|
| Unknown / inconclusive results refunded | |||
| Provider-graded catch-all confidence scores | |||
| Catch-alls stay Risky — never inflated to Valid | |||
| Zero-storage privacy mode (auto-purge) | |||
| Scheduled re-verify of completed bulk lists | |||
| Live bulk progress with ETA (SignalR) | |||
| Transparent SMTP reason codes & telemetry | |||
| Resilient large CSV bulk processing | |||
| Activity / engagement enrichment data |
Based on publicly marketed capabilities and our shipped product.
Simple pricing that scales with you
Pick a volume. No monthly plan. Credits never expire.
Pay as you go
Verification credits
Buy credits once. Use them forever — they never expire.
- Single email check
- CSV list verification
- Bulk verifier
- Unknown results refunded
- Credits never expire
- Catch-alls stay Risky
How many emails do you need to verify?
10,000 emails
See all packages€0.0035 per credit
Buy credits100 free credits on signup. Unknown results return to your balance automatically.
Privacy You Can Trust
Your data security is our top priority. We've built NexiphorVerifier with privacy at its core.
Zero-Storage Mode
Emails are processed for verification, then automatically deleted after your export window (1–72h). Not kept in permanent history.
GDPR-Ready Practices
Built with GDPR principles: data minimization, encryption, and deletion controls.
TLS Encryption
All data encrypted with TLS during transmission.
No Data Reselling
We never sell, share, or train models on your data.
Start with 100 free credits No card required
For cold-email teams and developers who need an honest verdict before they send.