Most validators give up on catch-all and greylisted addresses. HeroBounce resolves them - recovering the leads others leave behind. Upload a list and see the difference.
100 free validations/month • No credit card required • Runs in the background
Simple 3-step process to clean your email list and improve deliverability
Upload your email list via CSV file. We support lists up to 10,000 emails per upload. Drag and drop or select from your computer.
Our AI-powered system performs syntax, DNS, SMTP, and catch-all validation. Advanced algorithms detect disposable, role-based, and toxic emails.
Get a detailed report with validation status, confidence scores, and actionable insights. Export clean lists ready for your ESP.
Everything you need to clean and verify email lists at scale
Detects formatting errors, typos, and invalid email structures instantly.
Checks if the domain has valid mail servers configured to receive emails.
Connects to mail servers to verify if the specific mailbox exists.
95%+ accuracy identifying catch-all domains that accept all emails.
Identifies temporary/throwaway emails from services like 10MinuteMail.
Flags generic addresses like info@, support@, sales@ with lower engagement.
Upload and walk away - jobs run in the background while you work. Supports up to 50,000 emails per file on most plans.
Download results as CSV, Excel, or JSON. Segment by validation status.
Get insights on list quality, domain distribution, and confidence scores.
Protect your sender reputation and improve campaign performance
High bounce rates damage your sender reputation and can get you blacklisted. Verify emails before sending to keep bounce rates under 2%.
Industry Standard: ESPs recommend keeping bounce rates below 2%. Bulk verification helps you achieve this consistently.
Clean email lists improve inbox placement rates. Gmail, Outlook, and other providers reward senders with good list hygiene.
Result: Users report 15-65% improvement in inbox placement after cleaning their lists with HeroBounce.
Most ESPs charge based on list size or emails sent. Stop paying to send to invalid addresses and reduce your monthly costs.
ROI: If 10% of your 50K list is invalid, you're wasting $50-200/month on ESP costs alone.
Invalid emails skew your campaign metrics. Get accurate open rates, click rates, and conversion data by removing bad addresses.
Impact: Clean lists give you reliable data to optimize campaigns and calculate true ROI.
Clean purchased lists, verify signup forms, and maintain list hygiene to maximize campaign performance and deliverability.
Validate user signups in real-time, clean CRM data, and ensure onboarding emails reach new customers.
Verify prospect lists before outreach campaigns. Improve reply rates and protect your domain reputation.
Clean customer databases, validate checkout emails, and reduce cart abandonment email bounces.
Offer list cleaning as a service to clients. API access for integration into your workflow.
Validate up to 250,000 emails per month on Pro, integrate via REST API, and meet GDPR compliance requirements.
HeroBounce runs a live SMTP handshake on every address - the fastest verification method that actually confirms mailbox existence. When mail servers respond quickly, jobs fly. When servers apply rate limits, greylisting, or multi-step challenges, we handle those automatically and take the time needed to get you accurate results rather than a fast guess. You will receive a notification when your list is ready - most jobs complete within the hour.
We accept CSV, TXT, and Excel (.xlsx, .xls) files. Your file should have email addresses in a single column. We automatically detect the email column or you can specify it.
For syntax, DNS, and clear SMTP responses, accuracy is very high. Catch-all domains - where the server accepts any address - are genuinely harder to resolve. We recover 50-70% of them into actionable results using pattern analysis and AI scoring. Everything comes with a confidence score so you can decide your own threshold for what to send to.
Yes! Our bulk verification API allows you to upload lists programmatically and retrieve results. Perfect for integrating into your existing workflows or automating list cleaning.
Absolutely. All data is encrypted in transit (HTTPS) and at rest. We delete uploaded files after 30 days. We never share, sell, or use your email lists for any purpose other than verification.