Email Verifier - Fast Bulk Email Validation

Clean your email lists with enterprise-grade validation. Verify up to 10,000 emails per run with comprehensive validation including syntax checking, DNS/MX verification, disposable email detection, and role-based identification.

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📈 Process up to 10,000 emails per run | ⚡ 30-95% faster with smart optimizations | 💰 ~$0.001 per 10,000 emails | 🎯 500+ disposable services detected

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Why Email Verifier?

✅ Improve Deliverability - Remove invalid emails before sending campaigns ✅ Reduce Costs - Stop paying to send emails that bounce ✅ Protect Reputation - Prevent sender score damage from invalid addresses ✅ Save Time - Automated validation with intelligent DNS caching ✅ Get Insights - Detailed analytics and domain analysis included

What You Get

🎯 Comprehensive Validation

Feature	What It Does	Why It Matters
Syntax Validation	RFC 5321-compliant format checking	Catch typos and formatting errors
DNS/MX Verification	Real mail server lookup	Verify domain can receive email
Disposable Detection	Identifies 500+ temporary email services	Block throwaway addresses
Role-Based Detection	Flags generic addresses (info@, support@)	Identify low-engagement contacts
Reserved Domain Check	Catches test domains (example.com, localhost)	Prevent test data in production

⚡ Performance That Scales

• 10,000 emails per run - Process large lists in one go
• Fail-Fast Mode - 30-50% faster validation for invalid emails
• Smart DNS Caching - Up to 95% faster on repeated domains
• Concurrent Processing - Adjustable concurrency (1-50 simultaneous checks)
• Optimized Memory - Runs efficiently on 256 MB

📊 Advanced Analytics

• Confidence Scoring - Weighted 0-1 score with risk levels (LOW/MEDIUM/HIGH)
• Domain Analysis - Top domains, provider breakdown, diversity metrics
• Deduplication - Automatic duplicate removal saves 5-30% on costs
• Output Filtering - Save only the results you need (valid/review/reject)
• Separate Datasets - Auto-split results by risk category
• Real-Time Events - Track validation progress per check type

Quick Start

Basic Usage

{
  "emails": [
    "user@gmail.com",
    "support@business.com",
    "temp@10minutemail.com"
  ]
}

That's it! All validation checks are enabled by default.

Common Use Cases

📧 Email Marketing - Get Only Safe-to-Send Addresses:

{
  "emails": ["..."],
  "outputFilter": "accept",
  "deduplicate": true,
  "failFast": true
}

🎯 Lead Validation - Segment by Risk Level:

{
  "emails": ["..."],
  "separateDatasets": true,
  "includeDomainAnalysis": true
}

🧹 List Cleanup - Find Problem Addresses:

{
  "emails": ["..."],
  "outputFilter": "reject",
  "failFast": true
}

Configuration Options

Validation Settings

Option	Type	Default	Description
emails	array	required	Email addresses to validate (1-10,000)
checkMX	boolean	true	Verify DNS MX records
checkDisposable	boolean	true	Detect disposable email services
checkRoleBased	boolean	true	Identify role-based addresses

Performance Settings

Option	Type	Default	Description
failFast	boolean	false	Exit early on failures (30-50% faster)
timeout	integer	5000	DNS timeout in ms (1000-30000)
concurrency	integer	10	Concurrent validations (1-50)

Analytics & Filtering

Option	Type	Default	Description
outputFilter	string	'all'	Save only: 'all', 'accept', 'review', or 'reject'
separateDatasets	boolean	false	Split results into 3 datasets by risk
deduplicate	boolean	false	Remove duplicates before validation
includeDomainAnalysis	boolean	false	Add domain statistics to summary

Maximum Performance:

{
  "emails": ["..."],
  "failFast": true,
  "concurrency": 50,
  "timeout": 3000
}

Complete Analysis:

{
  "emails": ["..."],
  "separateDatasets": true,
  "includeDomainAnalysis": true,
  "deduplicate": true
}

Output & Results

Individual Email Results

Each email gets a detailed validation report:

{
  "email": "user@gmail.com",
  "valid": true,
  "score": 0.95,
  "risk": "LOW",
  "recommendation": "ACCEPT",
  "processingTimeMs": 145,
  "details": {
    "syntax": { "valid": true, "message": "Valid email syntax" },
    "reservedDomain": { "valid": true, "message": "Not a reserved domain" },
    "mxRecords": {
      "valid": true,
      "message": "MX records found",
      "records": ["gmail-smtp-in.l.google.com"]
    },
    "disposable": { "valid": true, "message": "Not a disposable email" },
    "roleBased": { "valid": true, "message": "Not a role-based email" }
  }
}

Summary Statistics

Overall validation summary saved to the OUTPUT key:

{
  "summary": {
    "total": 1000,
    "valid": 850,
    "invalid": 150,
    "risky": 75,
    "processingTimeMs": 12450,
    "averageTimePerEmail": 12.45
  },
  "performance": {
    "dnsCachedDomains": 150,
    "dnsCacheHitRate": 0.72,
    "avgValidationTimeMs": 12.45
  },
  "domainAnalysis": {
    "topDomains": [
      { "domain": "gmail.com", "count": 245, "percentage": 24.5 }
    ],
    "diversity": 0.85,
    "uniqueDomains": 127
  }
}

Understanding Results

Confidence Score (0.0 - 1.0)

Each email gets a weighted confidence score:

Check	Weight	Purpose
Syntax	25%	Fundamental format validation
MX Records	30%	Deliverability verification
Disposable	25%	Quality assurance
Role-Based	20%	Engagement potential

Risk Levels & Recommendations

Risk	Score Range	Recommendation	Action
LOW	0.8 - 1.0	ACCEPT ✅	Safe to send
MEDIUM	0.5 - 0.79	REVIEW ⚠️	Manual review suggested
HIGH	0.0 - 0.49	REJECT ❌	Do not use

Use Cases

Scenario	Challenge	Solution
📧 Email Marketing	High bounce rates hurt sender reputation	Clean lists before campaigns, remove disposables
👤 User Registration	Fake signups with throwaway emails	Block temporary addresses, verify domains exist
📊 Data Quality	Outdated customer databases	Validate existing contacts, flag risky addresses
🎯 Lead Generation	Wasting time on invalid leads	Filter disposables/role-based, prioritize quality
🔒 Fraud Prevention	Test emails in production data	Detect reserved domains, catch placeholder emails
💰 Cost Optimization	Paying to send undeliverable emails	Deduplicate lists, validate before importing

Performance Features Explained

⚡ Fail-Fast Mode

What: Exits validation immediately when a critical failure is detected (syntax, reserved domain, MX, disposable)

Benefit: 30-50% faster validation for invalid emails

Best For: Large list cleanup, high-volume processing

{ "failFast": true }

🛡️ Reserved Domain Detection

What: Catches test/documentation domains (example.com, localhost, *.local)

Benefit: Prevents test data from polluting production databases

Always Active: Cannot be disabled (critical safety feature)

🚀 Smart DNS Caching

What: Automatically caches DNS lookups for 5 minutes (up to 1,000 domains)

Benefits:

• 30-40% faster when domains repeat in same batch
• 95%+ faster for second batch with same domains
• Negative caching (remembers failures too)

Example: 1,000 emails with 100 duplicate domains = ~70% faster validation

📊 Domain Analysis

What: Optional comprehensive statistics about your email list

Includes:

• Top 10 domains with counts and percentages
• Provider breakdown (free email, business, disposable, role-based)
• Domain diversity score (0.0-1.0)

Use For: List quality assessment, fraud detection, campaign targeting

{ "includeDomainAnalysis": true }

🎯 Output Filtering

What: Save only the results you need (all/accept/review/reject)

Example: Email marketing campaigns can use outputFilter: 'accept' to get only safe-to-send addresses

{ "outputFilter": "accept" }

📂 Separate Datasets

What: Automatically split results into 3 datasets by risk level

Creates:

• valid-emails - ACCEPT recommendations (low risk)
• review-emails - REVIEW recommendations (medium risk)
• reject-emails - REJECT recommendations (high risk)

Benefit: Process each category with different workflows

{ "separateDatasets": true }

🔄 Deduplication

What: Remove duplicate emails before validation (case-insensitive)

Savings: 5-30% on processing time and costs

{ "deduplicate": true }

Technical Specifications

Metric	Value
Speed	~100-200 emails/second
Capacity	Up to 10,000 emails per run
Memory	256 MB minimum, 2048 MB maximum
Concurrency	1-50 simultaneous validations
DNS Timeout	1-30 seconds (default: 5s)
Test Coverage	240+ tests (validation, integration, library)

Reliability & Support

✅ Comprehensive Testing - 240+ tests ensure accuracy and stability ✅ Graceful Error Handling - Individual failures don't stop the entire run ✅ Descriptive Errors - Clear messages for troubleshooting ✅ Battle-Tested - Built with Apify SDK and TypeScript

Coming Soon

🔜 Email reputation checking via DNSBL services 🔜 Plus-addressing detection (user+tag@example.com) 🔜 SMTP verification for mailbox existence 🔜 Internationalized email support (Unicode domains)

Get Started Now

Ready to clean your email lists? Click Try for free above to start validating emails today!

Need help? Contact the developer for support and feature requests.

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