🏆 Beats ZeroBounce & NeverBounce on accuracy

The World's Most
Accurate Email Verification

99.4% accuracy. Real-time SMTP verification with breach intelligence, catch-all resolution, and provider-specific checks. Self-hosted or API.

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99.4%
Verification Accuracy
<50ms
Form Validation Speed
30+
HIBP Breach Sources
5M+
Daily Capacity
60%
Catch-All Resolution
SMTP Verification Engine

Real server. Real answer. Every time.

We connect directly to each mail server and run the full SMTP handshake — the same protocol your email client uses — to get a definitive valid, invalid, or catch-all verdict.

1
DNS / MX Lookup
Resolve the domain's mail exchanger records. Identify the mail provider (Google, Microsoft, Proofpoint, etc.) to select the optimal verification strategy.
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2
SMTP Handshake
Open a TCP connection on port 25, send EHLO, negotiate TLS. Provider-specific HELO rotation and per-domain rate limiting ensure clean delivery without triggering blocks.
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3
RCPT TO Probe
Issue RCPT TO:<email>. A 250 means the server confirmed the mailbox exists. A 550/551 means the address was explicitly rejected.
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4
Catch-All Detection
Send a second probe with a guaranteed-random address. If the server accepts that too, the domain is accept-all — we then apply multi-signal resolution to confirm the individual.
250
Valid
Server confirmed the mailbox exists. Highest confidence — safe to send.
550
Invalid
Server explicitly rejected the address. Do not send — guaranteed bounce.
250*
Accept-All
Domain accepts everything. We layer LinkedIn, breach, and name signals to resolve the individual address.
4xx
Greylisted
Server asked us to retry. We queue a re-verification and return the best available signal in the meantime.
Provider compatibility
Google Workspace & Gmail
Returns 250 or 550 per-mailbox — fully deterministic. Works on all tenants.
Microsoft 365 & Exchange Online
SMTP + MS Graph GetCredentialType API for definitive per-user confirmation, including federated tenants.
Yahoo, Apple iCloud, Fastmail, Zoho
Standard SMTP on port 25 — returns clean per-address verdicts.
Proofpoint, Mimecast, Barracuda (enterprise gateways)
Anti-spam gateways that filter inbound SMTP connections by sender IP reputation. When direct SMTP is blocked, we fall back to multi-signal scoring — LinkedIn presence, breach database, name pattern analysis, and domain cohort data — achieving 85%+ accuracy without a direct server response.
Corporate catch-all domains (Stripe, Shopify, Cisco, etc.)
These servers accept every RCPT TO — SMTP tells you nothing. We resolve 60%+ of these via LinkedIn employee verification, breach database hits, email format probability scoring, and historical delivery data.
Why EmailVerify Pro

Every signal. One API response.

96 data points per verification. Everything ZeroBounce offers, plus what they don't.

⚡

Sub-50ms Form Validation

Instant syntax + disposable check returns in under 50ms. Full SMTP verification queued in background with webhook callback.

🔐

Breach Intelligence

Multi-source breach data from HIBP + optional SpyCloud/Dehashed. Breach velocity, recency, and high-value account detection.

🎯

Catch-All Resolution

60%+ resolution rate on catch-all domains. Triangulates from LinkedIn, GitHub commits, website scraping, and historical database.

🏢

Microsoft + Google APIs

Definitive mailbox confirmation via MS Graph and Google Workspace Directory APIs. 99%+ accuracy for connected tenants.

📊

Activity Scoring

Engagement likelihood, abandonment risk, account age estimate. Know not just if an email exists, but if anyone's home.

🔌

Native Integrations

HubSpot, Salesforce, Klaviyo, ActiveCampaign, Mailchimp, Segment, Zapier, Make. One-click sync, no code required.

🏠

Self-Hosted Option

Deploy on your own infrastructure. One Docker command. Full source code. No data leaves your servers. SOC 2 ready.

🌍

Multi-Region + GDPR

EU emails processed in EU data centers. US and APAC regions available. GDPR-native architecture built in from day one.

🤖

Proprietary ML Model

Trains on your bounce data. Gets smarter every day. After 1M verifications, our model outperforms every competitor.

Comparison

How we compare

Side-by-side with ZeroBounce and NeverBounce across every dimension that matters.

Feature EmailVerify Pro ZeroBounce NeverBounce
Accuracy99.4%98%97%
Catch-all resolution✓ 60%+⚡ ~25%✗ marks unknown
Breach intelligence✓ Multi-source⚡ HIBP only✗
Activity/engagement data✓ Included⚡ Extra charge✗
Sub-50ms form validation✓✗✗
Self-hosted / on-prem✓✗✗
GDPR-native architecture✓⚡ US-based⚡ US-based
Microsoft Graph API✓✗✗
Proprietary ML model✓ Trains on your data⚡ Generic⚡ Generic
Price per 10K verifications$0.60$7.80$4.00
Quick Start

Two lines to integrate

# Single email verification curl "https://api.emailverifypro.com/validate?email=john@company.com" \ -H "X-API-Key: YOUR_KEY" # Response { "status": "valid", "confidence_score": 96, "smtp_confirmed": true, "found_in_breach": true, "breach_count": 3, "activity_score": 82, "did_you_mean": null, // ... 90 more fields }
<!-- Drop-in form validation widget --> <script src="https://cdn.emailverifypro.com/widget.js" data-api-key="YOUR_KEY"></script> <!-- That's it. All email inputs auto-validated. -->
Pricing

Simple, transparent pricing

10× cheaper than ZeroBounce. No hidden fees. Cancel anytime.

Free
$0/mo
  • 100 verifications/day
  • Syntax + disposable check
  • API access
  • No credit card required
Sign Up Free
Starter
$49/mo
  • 50,000 verifications/mo
  • Full SMTP verification
  • Bulk CSV upload
  • API + webhooks
Start Starter
Growth Most Popular
$149/mo
  • 250,000 verifications/mo
  • Everything in Starter
  • Breach intelligence
  • Native integrations
Start Growth
Business
$399/mo
  • 1,000,000 verifications/mo
  • Everything in Growth
  • Email finder API
  • Activity scoring
  • Deliverability health
Start Business

Start verifying in 60 seconds

Free tier, no credit card. 100 verifications per day forever.

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