Clean Lists.
Auto-Pilot Mode.
Connect SendSure to your CRM or ESP and let our engine continuously monitor, extract, and clean your data in the background. Protect your sender reputation without the manual exports.
The Manual Verification Cycle is Broken
Exporting lists, running them through a verifier, downloading the clean CSV, and re-importing them is a tedious, error-prone workflow. Worse, lists decay passively—if you aren't cleaning lists continuously, your next broadcast is at risk.
High Decay Rates
B2B email lists degrade at an average rate of 2.5% per month. Wait a few months, and your bounce rate spikes.
Delayed Discoveries
Waiting until right before a campaign to scrub your data leads to inevitable panic, ESP warnings, and delivery delays.
The SendSure SolutionFully Automated
Sync with your marketing platform in seconds.
- Zero Coding Required
Connect SendSure natively via OAuth or API tokens in less than three clicks.
- Deep Custom Mapping
Map precise list segments to verify and configure exact write-back fields (Contact Properties vs Tags).
Automatically clean your email lists.
- Silent Extraction Engine
SendSure runs quietly in the background, pinging your ESP to discover any newly added or modified subscribers.
- Intelligent Scrubbing
New emails are automatically run through our highly accurate verification engine, blocking risks instantly.
Schedule your scans. Set it and forget it.
Choose your cadence: Daily, weekly, or monthly. Put your list hygiene entirely on autopilot. SendSure wakes up exactly when it's supposed to, cleans your new additions, and protects your sender score.
Connect Once. Stay Clean Forever.
Connect Your Platform
Link your Mailchimp, HubSpot, Salesforce, ActiveCampaign, SendGrid, or other platforms securely using OAuth or API keys.
- Secure OAuth 2.0 flows
- 50+ direct integrations
Select & Configure
Choose which lists or segments you want to keep pristine. Set your preferred cadence (daily, weekly, monthly) and write-back rules.
- Granular list selection
- Custom mapping rules
Continuous Protection
SendSure works silently. We monitor for new additions, verify them, and update statuses back in your CRM automatically.
- Zero daily maintenance
- Always-ready data
Fair, Transparent Billing
Smart Caching Architecture
Our engine remembers. Why pay twice to verify the exact same email address?
- 100% Free Cached ResultsIf an email was valid yesterday, it's free to sync today. We respect the TTL of known good addresses.
- Only Pay for the DeltaGot 50 new signups on a 10,000 person list? The sync runs across the whole list, but you are only charged 50 credits.
Advanced Verification Infrastructure
Our background engine runs your CRM contacts through the absolute strictest, most rigorous email verification tests available on the market.
Universal B2B & B2C
Verifies enterprise B2B addresses exactly as effectively as B2C domains.
Global Reach
Processes international characters and pings foreign mail servers securely.
Proprietary Bypassing
Bypasses strict mail server greylisting natively without false positives.
Resilient Testing Network
Leverages a diverse network of nodes to improve latency and prevent blocks.
Adaptive Intelligence
Cross-references evolving spam traps and disposable networks.
High-Velocity Pipeline
Extracts and verifies millions of records without triggering CRM limits.
Frequently Asked Questions
Technical specifics about our syncing architecture
Bi-directional syncing means SendSure not only pulls your email lists from platforms like Mailchimp or HubSpot for verification, but also pushes the verification results back. We automatically update custom fields or apply tags so you can easily segment out invalid emails without manual exports.