Intelligent Email Quality Assessment: Interzoid's Email Trust Score API
Not all email addresses are created equal. Knowing whether an email belongs to a real person at a legitimate business is crucial for lead qualification, fraud prevention, and marketing efficiency. Instead of manually validating email quality or relying on simple syntax checks, Interzoid's Email Trust Score API provides an intelligent trust score from 0-99 with detailed reasoning in a single API call. This guide explains what it does, why it's useful, and how to get started with your own API key.
- 📘 API Reference: Email Trust Score API
- 🔑 Register for an API Key: www.interzoid.com/register-api-account
- 📖 Docs: Interzoid Documentation
What It Provides
The API uses advanced email intelligence algorithms to evaluate multiple factors and generate a comprehensive trust score. For each email address you submit, you receive:
- Trust score from 0-99 (higher indicates better quality)
- Detailed reasoning explaining the score factors
- Domain type assessment (corporate, free webmail, disposable)
- DNS health validation
- Mail server reputation analysis
- Local-part quality evaluation
- Domain reputation scoring
- Business fit assessment
This intelligent scoring helps you automatically qualify leads, prevent fraud, optimize workflows, and maintain high-quality contact databases across sales, marketing, and compliance systems.
Use Cases
- Lead Qualification: Automatically identify high-quality prospects versus disposable or low-quality contacts for better targeting and resource allocation.
- Fraud Prevention: Detect suspicious email patterns, temporary addresses, and low-quality contacts to reduce fraud risk and chargebacks.
- Business Process Automation: Route emails through different workflows based on quality scores (e.g., high-scoring corporate emails to sales, low-scoring to verification).
- Data Hygiene: Clean and score existing email databases to improve deliverability and engagement rates.
How to Call the API
Base endpoint:
https://api.interzoid.com/emailtrustscore
Required parameters:
license- your API keylookup- email address to evaluate
Example request:
https://api.interzoid.com/emailtrustscore?license=YOUR_API_KEY&lookup=billsmith11@gmail.com
Curl with header:
curl --header "x-api-key: YOUR_API_KEY" \ "https://api.interzoid.com/emailtrustscore?lookup=billsmith11@gmail.com"
Example JSON response:
{
"Email": "billsmith11@gmail.com",
"Score": "65",
"Reasoning": "Gmail domain provides medium score due to free webmail status, but realistic name pattern 'billsmith' with number suggests legitimate personal use, though lacks business domain verification.",
"Code": "Success",
"Credits": "591447"
}
Understanding the Scores
The API returns scores across the full 0-99 range. Here are real-world examples showing different quality levels:
- High Quality (90+): Corporate emails like maria.garcia@adobe.com score 96 - real person names at reputable companies make excellent prospects.
- Medium-High Quality (70-89): Business domains with role-based addresses like info@landscapesupplyco.net score 72 - valid but less personalized.
- Medium Quality (40-69): Free webmail with realistic names like bobsmith@gmail.com score 68 - moderate quality for prospecting but lack corporate verification.
- Very Low Quality (0-35): Disposable addresses like x9qz772@tempmail.plus score 5 - poor quality for any business use.
Getting Your API Key
You'll need to register for an Interzoid account to get an API key: www.interzoid.com/register-api-account. Once registered, you'll receive a license key with trial credits that you can use immediately to start evaluating email quality.
Best Practices
- Set score thresholds based on your use case (e.g., 80+ for premium leads, 50+ for general marketing, reject below 30).
- Use the detailed reasoning field to understand why scores are high or low and refine your processes.
- Batch process existing databases using Interzoid's no-code cloud batch tool for high-volume scoring.
- Always check the
Codefield in responses for proper error handling. - Monitor your credit usage via the
Creditsfield returned in each response.
The Email Trust Score API makes it easy to assess email quality with intelligent, multi-factor scoring in a single API call. Whether for lead qualification, fraud prevention, process automation, or data hygiene, it gives you the insights you need to make smart decisions about your email contacts. Start today by registering for an API key and adding intelligent email scoring directly into your workflows.