Trusted by teams worldwide
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The Email Verification Platform
Protect forms, clean lists, and keep your CRM verified — one real-time API.
27-Stage Verification Waterfall
Every email runs through 27 checks, from syntax to AI catch-all resolution.
Validation & Verification
Syntax Validation
RFC 5321 format checks for malformed addresses.
SMTP Verification
SMTP handshake confirms the mailbox exists.
Domain & MX Validation
Confirms domain, DNS, and MX records.
SPF & DMARC Check
Validates authentication records for deliverability.
DNS Resolution
Parallel DNS, A-record, and MX lookups.
Risk Detection
Spam Trap Detection
Catches pristine, recycled, and known traps.
Disposable Detection
Detects 123K+ disposable providers in real time.
Accept-All Detection
Flags catch-all servers with uncertain delivery.
Role Account Detection
Flags shared inboxes (info@, admin@, support@).
Bounce Intelligence
Skips addresses with a hard-bounce history.
Free Provider Detection
Spots Gmail, Yahoo, and applies tuned logic.
Data Enrichment
Name Detection
Extracts first and last names from addresses.
Typo Correction
Fixes misspelled domains (gmial.com → gmail.com).
SMTP Provider Details
Identifies the underlying email provider.
Tag & Subaddress Detection
Spots plus-addressing (user+tag@domain.com).
No-Reply Detection
Flags unmonitored inboxes (noreply@, mailer-daemon@).
Mailbox Full Detection
Detects over-quota mailboxes that reject mail.
Intelligence & Optimization
ML Risk Scoring
Quality score from patterns and domain reputation.
AI Catch-All Resolver
AI patterns (54K names) resolve catch-all results.
Anti-Greylisting
Smart retries handle 4xx temporary rejections.
Engagement Verification
Known opens and clicks upgrade to valid.
Duplicate Removal
Deduplicates your list before verification.
Multi-Source Cross-Check
Cross-checks Gravatar, GitHub, HIBP, and more.
Connect Everywhere, Verify Everything
Plug into your stack in minutes. No code changes.
Don't see your tool? Our REST API works anywhere — or request an integration.
Clean Data. Zero Manual Work.
Connect once; SendSure verifies new contacts on a schedule and writes results back.
HubSpotMailchimpSalesforceSet Up And Forget It
One-Click Integration
Connect HubSpot, Mailchimp, or Salesforce with secure OAuth — no API keys, no dev work.
Hands-Free Scheduling
Pick a daily, weekly, or monthly cadence; new contacts are verified before every campaign.
Bi-Directional Sync
Results write back as tags and custom fields, so your CRM always shows deliverable status.
Trusted By 2,500+ Email Teams
Real results from marketers, developers, and agencies who switched to 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 expiring is the reason we switched. 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 expiring is the reason we switched. 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 cut our signup bounce rate to under 1%.
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 cut our signup bounce rate to under 1%.
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.