Black Friday: 50% OFF with code BF2025!Sign Up

Reduce Email Bounces by 98%

Validate email addresses in real-time to protect your sender reputation and maximize deliverability. Join 1,000+ companies sending better campaigns.

Validate 25 Emails Free
No credit card required • Sub-second verification✨ Now with AI Integration
GDPR CompliantEU Data Residency

Trusted by 1,000+ Companies Worldwide

VolopayWebflowBeams

Verify an Email Address

Test our service. Verify an email address to get a detailed report.

5 free validations per hour. Email addresses are validated in real-time and not stored. Validation logs are retained for up to 30 days for debugging purposes. Privacy Policy

How It Works

Validate Emails in 3 Simple Steps

Get started in minutes with our intuitive platform designed for marketers and developers alike.

1Upload Your List

Import your email list via CSV, Excel, or connect directly through our API or integrations.

2Real-Time Validation

Our system validates each email in under 1 second, checking syntax, domain, mailbox, and detecting spam traps.

3Download Clean Results

Get a detailed report with validation scores and download only verified, deliverable emails.

Everything you need

Powerful Features for Clean Email Lists

Advanced validation technology that protects your sender reputation and maximizes deliverability

Real Inbox Verification

Confirm emails exist without sending—protect your sender score from hard bounces

Block Temporary Emails

Detect 3,000+ disposable domains that hurt engagement rates

Catch-All Detection

Identify catch-all addresses with low open rates to improve list quality

Instant Syntax Validation

Remove invalid email formats before they waste your credits

Domain Verification

Ensure domains exist and are configured to receive emails

Quality Scoring

Get a 0-10 score for each email to prioritize your best contacts

Developer-Friendly API

Integrate validation into your workflow in minutes with our REST API

Pay Only for Valid Emails

Credits only used for successful validations—syntax errors are free

AI-Powered Integration

Connect with Claude AI and other LLM clients via Model Context Protocol for intelligent email validation

Credit Alerts

Get notified when credits run low via email or webhooks—never run out unexpectedly

Works with Your Favorite Tools

Sync validated contacts automatically. No CSV uploads, no manual work.

HubSpot Integration

Sync with HubSpot CRM

Mailchimp Integration

Clean lists before sending

Mailjet Integration

Verify contacts in Mailjet

FluentCRM Integration

Validate WordPress contacts

Zapier Integration

Connect with 5,000+ apps

n8n Integration

AI workflow automation

Connect Your First Tool Free

No credit card required • 5-minute setup

Testimonials

Trusted by 1,000+ Companies Worldwide

“Out of all the tools we have tried, CampaignKit seemed to be the most user and tech-friendly. The integration was smooth and reduced our bounce rate from 8% to 0.5% in the first month.”

Ihaz
Volopay

“CampaignKit reduced our bounce rate from 12% to 0.8% in the first month, saving us $2,400 in ESP costs. It efficiently eliminates low-quality contacts to safeguard our sender score.”

Ahmad Alhusban
Email Marketing Manager

“The real-time API integration took just 5 minutes to set up. We've validated 500K+ emails and our deliverability improved by 35%. Best ROI we've had on any marketing tool.”

Sophia Chen
Growth Lead, SaaS Startup

“We switched from ZeroBounce and immediately saw better results at half the cost. CampaignKit has helped us maintain a 99.2% deliverability rate across 50K monthly sends.”

Liam O'Connor
Marketing Director

“Since switching to CampaignKit, our email marketing performance improved by 42%. The precision of their validation means we can focus on engaging real customers, not spam traps.”

Emma Nilsson
E-commerce Founder

See CampaignKit in Action

Start validating emails in 60 seconds. No credit card, no commitment. Get 25 free validations to test our service.

Start Free Trial
CampaignKit App screenshot

Frequently asked questions

Can’t find the answer you’re looking for? Reach out to our customer support team.

How does CampaignKit compare to competitors?
CampaignKit uses real-time mailbox verification to ensure the highest quality results. Unlike some competitors that rely solely on syntax checking, we verify the actual mailbox exists by connecting to mail servers, providing more thorough validation.
How do you protect my data?
We keep submitted email addresses only during validation. No email addresses are stored on CampaignKit's servers nor forwarded to any 3rd party service. All communication is encrypted with AES-256, and we're GDPR compliant with EU data residency.
Do you send emails during the validation?
No. No emails are ever sent to the recipient's mailbox. We use SMTP handshake protocols to verify mailbox existence without completing the email delivery, ensuring privacy and compliance.
How fast is bulk validation?
Single email validations complete in under 1 second. For bulk lists, we can process up to 10,000 emails in approximately 5 minutes, depending on the responsiveness of recipient mail servers. Some ESPs like Gmail may require slower processing to avoid rate limits.
Does this work for ESPs like Gmail, Yahoo, and Outlook?
Yes. Mailbox deliverability validation works for all major ESPs including Gmail, iCloud, Yahoo, Outlook, and others. Some providers may temporarily limit connection attempts, which our system automatically handles by adjusting validation speed.
How many emails can be verified?
There is no limit on email list sizes. You can verify millions of email addresses with our email validation service. Enterprise customers regularly validate lists exceeding 1M+ emails.
Do I need to buy credits?
Yes. You purchase credits based on your needs. A credit is only used for successfully validated emails—you don't pay for syntax failures. Credits never expire, and we offer volume discounts for larger purchases.
What payment methods do you accept?
We accept all major credit cards (Visa, Mastercard, American Express) and PayPal. Enterprise customers can request invoice billing with NET-30 terms.
Can I get a refund if I'm not satisfied?
Yes. We offer a 30-day money-back guarantee for first-time purchases. If you're not satisfied with the accuracy or service, contact support for a full refund—no questions asked.
How does the API integration work?
Our REST API is developer-friendly with comprehensive documentation. Most integrations take 5-10 minutes to set up. We provide SDKs for popular languages and offer real-time validation endpoints plus bulk processing options.
Do you offer enterprise plans?
Yes. Enterprise plans include dedicated infrastructure, custom rate limits, priority support, SLA guarantees, and volume discounts. Contact our sales team for custom pricing based on your validation volume.
What integrations are available?
We integrate with HubSpot, Mailchimp, Mailjet, and other major email platforms. You can also use our API, Zapier connection, or CSV upload for maximum flexibility.

Join 1,000+ CompaniesImproving Email Deliverability

Start with 25 free validations. Upgrade only when you're ready.

Create Free Account

No credit card required • Cancel anytime