Email Finder API

An Email Finder API is a programmable interface that allows applications to find professional email addresses for individuals based on inputs such as full name, company name, job title, or company domain. In B2B sales and marketing, it automates the process of email discovery and validation, helping teams reach decision-makers efficiently and at scale.

With an Email Finder API, businesses can turn lead records into verified contactable profiles, powering outreach, CRM enrichment, and personalization workflows.

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What Is an Email Finder API?

An Email Finder API is a type of REST API that receives identifying details (e.g., name + domain) and returns one or more professionally verified email addresses, along with metadata such as:

• ✉️ Email address
• ✅ Verification status (valid, risky, invalid)
• 🧑 Contact name
• 🏢 Company information
• 🔗 LinkedIn or profile URL
• 📬 Department or seniority level

This API is often used in sales platforms, Chrome extensions, CRMs, and custom apps to automate contact discovery.

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Why Email Finder APIs Matter in B2B

In B2B go-to-market strategy, sales and marketing teams must:

• 🧠 Identify decision-makers
• 📬 Find verified emails to reach them
• ⚙️ Personalize messages at scale
• ⏱ Eliminate manual prospecting bottlenecks

An Email Finder API accelerates this by offering programmatic access to real-time contact discovery. Instead of manually researching or guessing email formats, your systems get instant access to enriched contact data.

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Common Inputs to an Email Finder API

Input Type	Example
Full Name	“John Smith”
Company Domain	“cufinder.io”
Job Title	“Marketing Manager”
LinkedIn URL	linkedin.com/in/john-smith
Company Name	“CUFinder”

The API will then respond with the most probable and verified email for that individual.

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Typical Output From an Email Finder API

Field	Description
Email Address	e.g., john.smith@cufinder.io
Verification Status	valid / risky / invalid
Full Name	e.g., John Smith
Company	e.g., CUFinder
LinkedIn	Public profile link
Job Title	e.g., VP of Growth
Seniority	Manager, Director, VP, etc.
Location	Optional if available
Source	Method used to generate or confirm address

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CUFinder’s Email Finder API: Overview

CUFinder’s Email Finder API is built for:

• 🎯 B2B lead generation platforms
• 📊 Sales automation tools
• 📬 Cold outreach campaigns
• ⚙️ CRM data enrichment
• 🧠 Recruiting tools and candidate sourcing apps

🔧 Features:

• Lookup by name + domain, or via LinkedIn URL
• Returns verified professional email addresses
• Provides job title, company, and social metadata
• Supports real-time queries and batch enrichment
• API key authentication with rate limits
• JSON format for easy parsing and integration

🧠 Benefits:

• Boost email campaign performance
• Improve targeting in sales and ABM
• Reduce bounce rates and protect sender reputation
• Save time on manual prospect research
• Scale lead generation through automation

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Example API Request and Response

Request (GET by name + domain):

httpCopyEditGET https://api.cufinder.io/v1/email-finder?name=John Smith&domain=cufinder.io
Authorization: Bearer YOUR_API_KEY

Response (JSON):

jsonCopyEdit{
  "email": "john.smith@cufinder.io",
  "status": "valid",
  "name": "John Smith",
  "company": "CUFinder",
  "linkedin": "https://linkedin.com/in/johnsmith",
  "title": "VP of Marketing"
}

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Top Use Cases for an Email Finder API

Use Case	Description
Cold Email Campaigns	Fuel outreach with verified contacts
LinkedIn-to-Email Workflows	Turn public LinkedIn profiles into contactable leads
CRM Enrichment	Fill in missing email fields in Salesforce, HubSpot, etc.
Web Form Completion	Find missing email using company + name
Lead Scoring	Assign higher score to leads with verified contact info
Hiring/Recruiting	Find work emails for passive candidates
Sales Extensions	Power Chrome extensions with real-time data
SaaS Platforms	Build email lookup features into your own app

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Email Finder API vs Email Verification API

Feature	Email Finder API	Email Verification API
Purpose	Find missing email addresses	Verify if existing email is valid
Input	Name, company, LinkedIn	Email address
Output	Email + metadata	Status: valid, risky, invalid
Use Case	Prospecting, enrichment	Deliverability and hygiene

CUFinder offers both APIs, allowing you to find and validate leads in a single pipeline.

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Integration Examples

Tool / System	Integration Value
CRMs	Auto-enrich new contacts with email addresses
Sales Outreach Tools	Pre-fill email fields in Lemlist, Instantly, Outreach
Forms + Lead Gen Pages	Automatically populate contact records
SaaS Platforms	Build B2B email lookup features inside your app
Zapier / Make	Automate lookups from spreadsheets, forms, and triggers
Browser Extensions	Lookup emails from LinkedIn or company sites

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Best Practices

• 🧠 Use verified, business-intent inputs (e.g., full name + domain)
• ⚠️ Exclude free email domains (gmail, yahoo)
• 🔁 Implement email validation after lookup
• 🧩 Respect API rate limits and plan for retries
• 🔐 Keep API keys secure
• 🔄 Schedule periodic re-verification for stale leads
• ✅ Test in sandbox environments before production use

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Cited Sources

• Wikipedia: Email address
• Wikipedia: Email verification
• Wikipedia: Application programming interface
• Wikipedia: Lead generation

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Related Terms

• Contact API
• Company Data API
• Email Verification API
• Lead Enrichment
• Email Outreach
• Cold Emailing
• B2B Data Provider
• CRM Enrichment
• Lead Scoring
• Email Deliverability
• Technographics

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FAQ