Email AppendAPI
Append verified email addresses using name and address data. High-quality consumer intelligence with confidence scoring and compliance-friendly enrichment workflows.
High Quality
Match Accuracy
10 tokens
Per Request
Datazapp
Data Source
Complete Email Enrichment Platform
Multi-field matching for maximum accuracy and confidence
Verified Consumer Intelligence
Matches against premium consumer databases with confidence scoring for each appended email. Uses Datazapp contact intelligence for maximum accuracy.
Address-Normalized Matching
Cleans and normalizes address inputs to improve match rates across fragmented data sources. Handles variations in street names, abbreviations, and formatting.
Multi-Field Confidence
Uses name, street, city, and ZIP signals to return the highest-confidence email for each record. Multiple data points ensure reliable enrichment.
Quality Insights & Reporting
Get quality indicators and match explanations to decide when to trust or review appended data. Transparent match reasoning for compliance.
Email Append Use Cases & Results
Real businesses achieving measurable improvements with email enrichment
Lead Enrichment & Nurture
Fill missing emails on inbound leads to trigger nurture sequences faster. Improve contactability and accelerate pipeline velocity.
- Faster nurture activation
- Improved contactability
- Pipeline acceleration
- Lead scoring boost
CRM Hygiene & Backfill
Backfill missing emails in legacy CRMs and keep sales, support, and billing teams aligned on best contacts for each account.
- Legacy data recovery
- Team alignment
- Complete records
- Better segmentation
Outbound Personalization
Identify the best email per contact for outbound programs while preserving deliverability and sender reputation.
- Optimal email selection
- Deliverability focus
- Sender protection
- Campaign optimization
Customer 360 & Identity
Build complete customer profiles by appending verified emails across touchpoints. Unify records and enhance identity resolution.
- Profile completion
- Identity resolution
- Cross-channel unification
- Better personalization
Industries Using Email Append
Trusted across sectors for contact enrichment and data completion
Why Choose 1Lookup Email Append?
Premium data quality with transparent pricing
Premium Consumer Database
Access to Datazapp consumer intelligence with billions of records and regular updates
Confidence Scoring
Every match includes quality indicators so you know which results to trust immediately
Address Normalization
Built-in address cleaning improves match rates without preprocessing on your end
Transparent Pricing
Simple token-based pricing at 10 tokens per request with no hidden fees
Simple Email Append Integration
Enrich contacts with a single API call
// Email append from name and address
const response = await fetch('https://api.1lookup.io/api/lookup', {
method: 'POST',
headers: {
'Authorization': 'Bearer YOUR_API_KEY',
'Content-Type': 'application/json'
},
body: JSON.stringify({
type: 'email-append',
firstName: 'Jane',
lastName: 'Smith',
address: '123 Main Street',
city: 'Austin',
zip: '78701'
})
})
// Response
{
"success": true,
"email": "jane.smith@example.com",
"confidence": 0.85,
"match_type": "exact",
"tokens_used": 10
}Email Append API FAQ
Common questions about our email enrichment service
Our email append API requires first name, last name, street address, city, and ZIP code. The more accurate your input data, the higher the match rate and confidence score.
Match rates vary based on input quality, but typically range from 30-60% for consumer records. Each result includes a confidence score to help you decide which emails to use immediately vs. review.
Email append returns the best-matching email from our consumer database. We recommend pairing with our Email Validation API to verify deliverability before sending.
Email validation checks if an existing email is deliverable. Email append finds an email address when you only have name and address information. They complement each other in a complete data enrichment workflow.
If no match is found, the API returns a no-match response. You are still charged for the lookup attempt as the database search was performed.
Our data is sourced from compliant consumer databases. However, you are responsible for ensuring your use case complies with applicable laws like CAN-SPAM, GDPR, and CCPA.
Technical Specifications
Token Cost
10 tokens
Data Source
Datazapp
Match Rate
30-60%
Input Fields
5 required
Confidence
Included
Response
Real-time
Start Enriching Contacts Today
Append verified emails to your contact database with confidence scoring and quality indicators
100 free credits • Setup in 5 minutes • Premium support