Tired of Email Bounces Hurting Your Business?
Invalid emails in your list cause real damage. SendSure fixes that.
High Bounce Rates
Bounce rates above 3% destroy your sender reputation and get you blacklisted.
Wasted Spend
You're paying ESPs to send to addresses that don't exist.
Poor Campaign ROI
Bad data skews your analytics — you can't optimize accurately.
Spam Folder Delivery
Damaged reputation pushes even good emails to spam.
The Anatomy of Clean Data
Upload & Import
Drag and drop your CSV or connect your CRM. We support Mailchimp, HubSpot, Salesforce, and 50+ others.
- Direct CSV, XLS, TXT uploads
- Native CRM API syncs
Active Validation
Our engine performs a comprehensive 27-point inspection on every single address, bypassing greylisting.
- Deep SMTP Handshakes
- Greylisting bypass tech
Granular Analysis
Every address is scored and explicitly tagged with the exact reason it failed or succeeded.
- Explicit categorization
- Safety scores
Segmented Export
Download exactly what you need as a CSV or push clean data back to your ESP with custom filters.
- Secure CSV download
- Two-way CRM sync
9 Strategic Benefits of Email Verification
Every clean email in your list is an opportunity. Every bad one is a liability.
Protect Domain Reputation
Keep your sender score high for consistent inbox placement.
Stay Off Blacklists
Avoid ISP flags that can tank your entire email program.
Keep Lists Clean
Maintain list hygiene for better campaign performance.
Reduce Bounces
Target <2% bounces by eliminating hard bounces.
Improve Deliverability
See 20%+ deliverability improvement after verification.
Accurate Metrics
Remove invalid emails that skew your open and click rates.
Boost Engagement
More opens, clicks, and conversions from real addresses.
Eliminate Bad Signups
Remove typos, disposables, and fake emails from your CRM.
Save Money
Verification pays for itself in the first campaign.
Built for Massive Scale
Process millions of emails without breaking a sweat. SendSure's high-throughput architecture ensures you never have to wait long for your clean data, no matter the list size.
View Enterprise LimitationsWho Benefits from Bulk Verification?
Different teams have different goals, but they all rely on clean list hygiene to succeed and communicate directly with real users.
How Much Are Bad Emails Costing You?
Every bounced email costs money and damages your sender reputation. See the real impact of cleaning your list.
* Based on average ESP costs and reduced bounce-related penalties
Without Verification
- ESP warnings & penalties
- Blacklist risk
- Poor deliverability
- Wasted sending costs
With SendSure
- Protected reputation
- Better inbox placement
- Higher engagement
- Lower costs
Frequently Asked Questions
Everything you need to know about bulk email verification
How accurate is the verification?
SendSure achieves 99%+ accuracy through our 27-check verification engine. We use real-time SMTP validation, DNS lookups, MX record checks, and proprietary algorithms refined over millions of verifications.
How long does verification take?
We process 30,000+ emails per minute. A list of 100,000 emails typically completes in under 4 minutes. You can track progress in real-time from your dashboard.
What file formats do you support?
We accept CSV, TXT, and XLS/XLSX files. We auto-detect the email column, or you can specify which column to verify. You can also paste emails directly into the dashboard.
Is my data secure?
Absolutely. All data is encrypted during processing using 256-bit TLS encryption. Lists are automatically deleted within 30 days. We never share, sell, or use your data for any other purpose.
What's included in the results?
Each email receives a status (valid, invalid, risky, unknown), a confidence score (0–100), reason codes explaining the result, and flags for disposable addresses, role-based emails, catch-all domains, and more.
Can I integrate with my existing tools?
Yes! We offer direct integrations with Mailchimp, HubSpot, Salesforce, Zapier, and more. Our REST API enables custom integrations with any platform in minutes.