Triple Verification

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.

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The Process

Triple-Layer 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

Smart Detection

Beyond Simple 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.

Live Example

See It In Action

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

Average response time181ms

verification_response.json

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]">false
15  },
16  [#e06c75]">"risk_level": [#98c379]">"low",
17  [#e06c75]">"confidence_score": [#d19a66]">98,
18  [#e06c75]">"verification_time_ms": [#d19a66]">147
19}

99.9%

Accuracy

<200ms

Avg. Response

50K+

Disposable Domains

10M+

Emails Verified Daily

Results

Protect Your Sender Reputation

See how teams are reducing bounce rates with Cleanlist verification.

MarketingPro

Email Marketing

Bounce Rate

0.8%

-94%

SalesForce Co

SaaS

Deliverability

99.2%

+12%

Lead Gen Inc

Lead Generation

Valid Emails

847K

/month

Outreach Labs

Sales Engagement

Sender Score

+23