Verify email addresses before you send. Reduce bounces, protect your sender reputation, and increase deliverability with our powerful verification API and bulk validation tools.
Trusted by innovative companies worldwide
Choose the integration method that fits your workflow perfectly
Upload CSV or connect your ESP to verify thousands of emails in minutes. Perfect for periodic list hygiene and improving deliverability.
Integrate real-time verification directly into your signup flow, CRM, or custom application.
Protect your lead generation forms without writing backend code. Just copy-paste one script.
Works for marketers, sales teams, and developers alike. Upload once, get clean data forever.
Plug SendSure into your stack in minutes — no code changes required
Don't see your tool? Our REST API works with any platform, or request an integration.
Our 18-stage verification engine catches what others miss.
Connects to mail servers to verify mailbox existence without sending emails.
RFC-compliant syntax checking ensures proper email format.
Verifies domain exists and is configured to receive email.
Validates email authentication records for improved deliverability insights.
Identifies known spam traps and honeypots to protect your sender reputation.
Identifies temporary email addresses from 5,000+ disposable providers.
Identifies catch-all servers that accept all emails but may not deliver.
Flags role-based addresses like info@, admin@, support@.
Machine learning-powered quality score from 0-100 for every email.
Identifies free email providers like Gmail, Yahoo, Outlook.
Extracts first and last name from email addresses automatically.
Detects and suggests fixes for common domain typos (gmial.com → gmail.com).
Identifies SMTP provider (Google Workspace, Microsoft 365, etc.).
Identifies emails with tags (user+newsletter@domain.com).
Advanced retry logic handles temporary rejections for accurate results.
Automatically removes duplicate emails from your list.
Identifies unmonitored mailboxes (noreply@, notifications@).
Detects when a mailbox is over quota and cannot receive mail.
Quickly build production-ready integrations with modern tools and simple documentation. Our API is easy to use and quick to set up.
const SendSure = require('sendsure');
const client = new SendSure('YOUR_API_KEY');
// Verify a single email
const result = await client.verify('user@example.com');
console.log(result.status); // 'valid'
console.log(result.score); // 95
console.log(result.flags); // ['has_mx', 'has_spf']Join 2,500+ companies improving their email quality
"Bounce rate dropped from 12% to under 0.5% in the first month. The ROI was immediate."
"We verified 500,000 emails in under 15 minutes. The speed is unreal."
"API integration took under an hour. Response times consistently under 200ms."
"Deliverability improved by 40% within two weeks of switching to SendSure."
"The form widget stopped 80% of fake leads from ever entering our CRM."
"Credits never expire is a game changer. Buy once, use at your own pace."
"Bounce rate dropped from 12% to under 0.5% in the first month. The ROI was immediate."
"We verified 500,000 emails in under 15 minutes. The speed is unreal."
"API integration took under an hour. Response times consistently under 200ms."
"Deliverability improved by 40% within two weeks of switching to SendSure."
"The form widget stopped 80% of fake leads from ever entering our CRM."
"Credits never expire is a game changer. Buy once, use at your own pace."
"GDPR compliance made easy. Their security documentation was thorough."
"Best accuracy we've tested, hands down. Catches disposables others miss."
"Customer support is incredibly responsive. Real humans, not bots."
"Best pricing for our volume. Saved 40% compared to our previous provider."
"Real-time verification is a game changer for our signup flow."
"Documentation is crystal clear. Had our integration running in an hour."
"GDPR compliance made easy. Their security documentation was thorough."
"Best accuracy we've tested, hands down. Catches disposables others miss."
"Customer support is incredibly responsive. Real humans, not bots."
"Best pricing for our volume. Saved 40% compared to our previous provider."
"Real-time verification is a game changer for our signup flow."
"Documentation is crystal clear. Had our integration running in an hour."
"Haven't hit a spam trap since we started using SendSure. Our deliverability is bulletproof."
"From signup to first verification in under 10 minutes. Easiest tool I've ever integrated."
"Finally getting accurate open rates. Our email analytics actually make sense now."
"We recommend SendSure to all our clients. It's become part of our standard toolkit."
"Love having both batch upload and API access. Perfect for our hybrid workflow."
"Went from 50K to 500K monthly sends. SendSure handled the scale without breaking a sweat."
"Haven't hit a spam trap since we started using SendSure. Our deliverability is bulletproof."
"From signup to first verification in under 10 minutes. Easiest tool I've ever integrated."
"Finally getting accurate open rates. Our email analytics actually make sense now."
"We recommend SendSure to all our clients. It's become part of our standard toolkit."
"Love having both batch upload and API access. Perfect for our hybrid workflow."
"Went from 50K to 500K monthly sends. SendSure handled the scale without breaking a sweat."
We back our platform with real commitments, not just promises.
No more than 1% of verified emails will bounce.
8x faster than competitors. 100K in under 3 min.
Enterprise-grade infrastructure, globally distributed.
Real humans ready to help around the clock.
Credits never expire. Buy once, use forever.
Pay only for what you use. Credits never expire. Start free today.
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