Trusted by innovative companies worldwide
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The Email Verification Platform
End-to-end email hygiene for your entire stack. Protect your forms, clean your existing lists, and keep your CRM perfectly synced.
27-Stage Verification Waterfall
Every email passes through our multi-layer verification pipeline. From syntax to AI-powered catch-all resolution — nothing gets missed.
Validation & Verification
Syntax Validation
RFC 5321-compliant format checking catches invalid characters and malformed addresses.
SMTP Verification
Connects directly to mail servers via SMTP handshake to confirm mailbox existence.
Domain & MX Validation
Verifies the domain exists, resolves DNS, and confirms MX records are configured.
SPF & DMARC Check
Validates email authentication records for deliverability and anti-spoofing insights.
DNS Resolution
Performs parallel DNS, A-record, and MX lookups to validate mail infrastructure.
Risk Detection
Spam Trap Detection
Identifies pristine traps, recycled honeypots, and known spam trap patterns.
Disposable Detection
Detects 123K+ temporary and disposable email providers in real time.
Accept-All Detection
Identifies catch-all servers that accept every address, flagging uncertain delivery.
Role Account Detection
Flags role-based addresses (info@, admin@, support@) that go to shared inboxes.
Bounce Intelligence
Leverages historical hard bounce data to skip known-bad addresses.
Free Provider Detection
Identifies free email services (Gmail, Yahoo) and applies provider-specific logic.
Data Enrichment
Name Detection
Extracts first and last names from email addresses using extensive name databases.
Typo Correction
Detects misspelled domains (gmial.com → gmail.com) and suggests corrections.
SMTP Provider Details
Identifies the underlying email service provider for richer delivery context.
Tag & Subaddress Detection
Identifies plus-addressing and subaddress tags (user+tag@domain.com).
No-Reply Detection
Flags unmonitored inboxes (noreply@, mailer-daemon@) that won't see your emails.
Mailbox Full Detection
Detects over-quota mailboxes that cannot receive new mail.
Intelligence & Optimization
ML Risk Scoring
Machine learning-powered quality score combining pattern analysis and domain reputation.
AI Catch-All Resolver
AI-powered pattern analysis (54K name database) resolves uncertain catch-all results.
Anti-Greylisting
Smart retry logic handles 4xx temporary rejections for accurate results.
Engagement Verification
Emails with known opens and clicks are automatically upgraded to valid.
Duplicate Removal
Automatically deduplicates your list before verification.
Multi-Source Cross-Check
Cross-references Gravatar, GitHub, HIBP and more for independent verification.
Connect Everywhere, Verify Everything
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.
Clean Data. Zero Manual Work.
Connect your favorite marketing tools in minutes. We automatically fetch, verify, and update your lists on your schedule. Never export a CSV again.
HubSpotMailchimpSalesforceSet Up & Forget It
Seamless Integration
Securely log in to your favorite platform once using OAuth. No API keys, no messy setups.
Hands-Free Scheduling
We'll pull new contacts automatically right before you send your next campaign.
Bi-Directional Sync
Detailed validation results are sent back immediately with custom fields and tags applied.
Built for Businesses That Demand Results
We don't just verify — we guarantee results. If more than 1% of verified emails bounce, we'll credit your account. No questions asked.
Trusted by 2,500+ Email Teams Worldwide
Real results from real companies. See why marketing teams, developers, and agencies choose SendSure.
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.
From signup to first verification in under 10 minutes.
Finally getting accurate open rates. Our email analytics actually make sense now.
We recommend SendSure to all our clients.
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.
From signup to first verification in under 10 minutes.
Finally getting accurate open rates. Our email analytics actually make sense now.
We recommend SendSure to all our clients.
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.