Verify Emails in Real-Time
Integrate email verification directly into your sign-up flows, CRMs, and applications. Stop bad emails before they enter your database.
{
"email": "user@company.com",
"status": "valid",
"score": 98,
"checks": {
"syntax": true,
"mx_records": true,
"smtp_check": true,
"disposable": false,
"role_based": false
},
"reason": "deliverable"
}The World's Most Accurate Verifier API
Identify over 30+ email types in real-time. Protect your sender reputation by blocking bad emails at the source.
Valid Emails
- • Genuine addresses
- • Verified MX records
- • Accept-all domains
- • AI Scored confidence
Invalid Emails
- • Syntax errors & Typos
- • No DNS entries
- • Unroutable IPs
- • Mailbox doesn't exist
Threat & Risks
- • Spam traps & Honeypots
- • Disposable / Temporary
- • Toxic & Abuse domains
- • Role-based (admin@, sales@)
Integrate Where It Matters
See how SendSure fits into your workflow at every touchpoint.
Real-Time Form Validation
Validate emails the moment users enter them. Instant feedback improves UX and prevents bad data from ever reaching your database.
- Average 200ms response time
- Block fake signups at the source
- Suggest fixes for typos
Common Integration Points
Developers use SendSure's API across their entire stack
User Registration
Validate emails during signup before sending confirmation emails.
CRM Import
Clean contact lists on import to keep your CRM data pristine.
E-commerce Checkout
Verify customer emails before order confirmation to prevent delivery issues.
Marketing Automation
Validate leads before adding to drip campaigns for better deliverability.
Simple, Powerful Integration
Start verifying emails with a single API call. Standard HTTP methods and descriptive JSON responses.
const SendSure = require('sendsure');
const client = new SendSure('YOUR_API_KEY');
// Verify a single email
const result = await client.verify('user@example.com');
if (result.status === 'valid') {
console.log('Email is deliverable!');
console.log(`Confidence: ${result.score}%`);
} else {
console.log(`Rejected: ${result.reason}`);
}API Service at a Glance
Deploys instantly across your stack to block bad signups, clean incoming leads, and preserve your sender reputation.
Validate Instantly
Intercept invalid addresses in milliseconds at registration, checkout, or CRM import.
- Blocks disposables & role-based
- Real-time typo correction
Complete SDKs
Integrate easily with native libraries for Node.js, Python, PHP, Ruby, Java, Go, and more.
Geo-Redundant
Deployed globally with smart latency-based routing to ensure requests hit the closest server.
- 99.99% Uptime SLA
- ~200ms average response
99% Accuracy
Guaranteed precision
Real-Time
<200ms form checks
Rapid Scale
Auto-scaling infrastructure
Secure
256-bit TLS encryption
Frequently Asked Questions
Common questions about the SendSure API
What does the API response include?
Each response includes status (valid, invalid, risky, unknown), a confidence score (0–100), reason codes, and flags for disposable addresses, role-based emails, catch-all domains, and more.
What are the rate limits?
The API supports 100+ concurrent requests per second. For higher volumes, our batch endpoint can process up to 1,000 emails per call with webhook callbacks for results.
Do you offer sandbox/test mode?
Yes! Use test API keys to verify against our sandbox without consuming credits. The sandbox returns realistic responses for testing your integration.
How do I handle errors?
The API returns standard HTTP status codes with descriptive JSON error bodies. Our SDKs include built-in retry logic with exponential backoff for transient failures.
Is the API GDPR compliant?
Absolutely. All data is encrypted in transit and at rest. We do not store email addresses beyond the verification request. We are SOC 2 Type II certified.