99.9% deliverability. Guaranteed.
Our Triple Verification system checks every email through three layers: Syntax Check → MX/DNS Validation → SMTP Handshake. Catch bounces before they happen.
Verification
Every email passes through three rigorous validation steps before we mark it deliverable.
Syntax Check
Validates email format, checks for typos, and normalizes the address according to RFC 5322 standards.
- RFC 5322 compliance
- Domain format validation
- Local part verification
- Common typo detection
MX/DNS Validation
Queries DNS records to verify the domain exists and has valid mail exchange (MX) servers configured.
- MX record lookup
- DNS resolution check
- Mail server discovery
- Domain age verification
SMTP Handshake
Performs a real-time ping to the mail server without sending an email to verify the mailbox exists.
- Real-time server ping
- Mailbox existence check
- Catch-all detection
- Greylisting handling
Verification
We don't just check if an email is valid. We identify risky addresses that could hurt your sender reputation.
Disposable Email Detection
Identifies temporary/burner emails from 50,000+ known disposable domains (Mailinator, Guerrilla Mail, etc.).
Role-Based Detection
Flags generic addresses like info@, support@, sales@ that often bounce or go unread.
Catch-All Detection
Identifies domains configured to accept all emails, reducing false positives in your lists.
Accept-All Detection
Detects servers that claim to accept everything, helping you filter low-confidence addresses.
See It
Real verification results in under 200ms.
Verification Results
john@company.com
Valid
147ms
test@mailinator.com
Disposable
Invalid
89ms
info@startup.io
Role-based
Risky
203ms
sarah@techcorp.io
Valid
156ms
bounce@invalid.xyz
No MX records
Invalid
312ms
1{2 [#e06c75]">"email": [#98c379]">"john.smith@company.com",3 [#e06c75]">"valid": [#d19a66]">true,4 [#e06c75]">"deliverable": [#d19a66]">true,5 [#e06c75]">"result": {6 [#e06c75]">"syntax_valid": [#d19a66]">true,7 [#e06c75]">"mx_found": [#d19a66]">true,8 [#e06c75]">"mx_host": [#98c379]">"mail.company.com",9 [#e06c75]">"smtp_check": [#d19a66]">true,10 [#e06c75]">"mailbox_exists": [#d19a66]">true,11 [#e06c75]">"catch_all": [#d19a66]">false,12 [#e06c75]">"disposable": [#d19a66]">false,13 [#e06c75]">"role_based": [#d19a66]">false,14 [#e06c75]">"free_provider": [#d19a66]">false15 },16 [#e06c75]">"risk_level": [#98c379]">"low",17 [#e06c75]">"confidence_score": [#d19a66]">98,18 [#e06c75]">"verification_time_ms": [#d19a66]">14719}99.9%
Accuracy
<200ms
Avg. Response
50K+
Disposable Domains
10M+
Emails Verified Daily
Protect Your
See how teams are reducing bounce rates with Cleanlist verification.
MarketingPro
Email Marketing
Bounce Rate
0.8%
SalesForce Co
SaaS
Deliverability
99.2%
Lead Gen Inc
Lead Generation
Valid Emails
847K
Outreach Labs
Sales Engagement
Sender Score
98
Frequently Asked Questions
How does Cleanlist's email verification work?
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Cleanlist uses triple-layer verification: syntax validation (RFC 5322 compliance), DNS/MX record lookup (domain exists and accepts email), and SMTP handshake verification (mailbox exists). We also detect catch-all domains, disposable emails, role-based addresses, and spam traps.
What accuracy rate does email verification achieve?
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Cleanlist achieves 99.9% deliverability on verified emails. Our triple verification process catches invalid, risky, and undeliverable addresses before you send, reducing bounce rates to under 1%.
How does catch-all email detection work?
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Catch-all domains accept all emails regardless of whether the specific mailbox exists. Cleanlist detects catch-all servers and flags these addresses as 'risky' so you can handle them separately - either exclude them from campaigns or test with lower volume.
Can I verify emails in bulk?
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Yes. Upload CSV files with up to 10,000+ emails per batch. Cleanlist verifies each email through all three layers and returns results with status (valid, invalid, risky), confidence score, and reason codes. Bulk verification typically completes within minutes.
How much does email verification cost?
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Email verification uses the same credit system as enrichment: 1 credit = 1 email verified. The free plan includes 30 credits per month. Paid plans start at $29/month for 500 credits. No setup fees or minimum commitments.