mailcheck.fr verifies every address on your list through a real SMTP connection, not just a DNS ping. Results in under 2 seconds, 98.7% certified accuracy, 100% French infrastructure and GDPR compliant. Ideal for B2B marketing teams that want to protect their sender reputation.
2 free verifications · no credit card · Results in <2s
Check whether an email address actually receives emails
2 free verifications per day · Create an account to do more
A mere 5% bounce rate on a list of 50,000 contacts means 2,500 emails lost per campaign. With every send, you burn budget, reputation and sales opportunities. Quantify the impact in 30 seconds.
Results based on France 2024 industry averages · For guidance only
No-code interface or full API · import your file, get results in real time.
Drag and drop your CSV file, paste your addresses directly or send them via the API. No configuration, immediate results.
Our engine checks every address: syntax, DNS, MX records, SMTP, catch-all and disposable domains. Result in under 2 seconds per email.
Download your filtered list with a quality score per address. Re-import the clean CSV into your ESP for maximum deliverability.
Our Chrome extension adds open tracking right inside your inbox. You can see whether your sent emails have been read, when and how many times, with a full history in your dashboard.
Connect your tracking data to Claude and ask in plain language: how many times a contact opened an email, how fast, who didn't reply this week. The AI queries your data and answers, with no dashboard to dig through.
Discover the MCP connectorOur JSON API is designed for developers who want to verify emails in real time at signup. Full documentation, PHP, Python, Node.js SDKs and an API key available immediately.
# Verify an email address
curl -X POST https://api.mailcheck.fr/v1/verify
-H "Authorization: Bearer YOUR_API_KEY"
-H "Content-Type: application/json"
-d '{"email":"[email protected]","options":{"catch_all":true}}' {
"email": "[email protected]",
"status": "valid",
"score": 97,
"checks": {
"syntax": true,
"dns": true,
"mx": true,
"smtp": true,
"disposable": false,
"catch_all": false
},
"confidence": "high"
} No commitment. Change plan at any time. Cancel in one click.
Need to verify more than 1 million emails per month?
Custom volume, dedicated SLA, guided integration. We reply in under 4h.
Contact usAll prices excl. tax · 20% VAT applicable · No monthly commitment · Annual subscription = 10 months (2 months free) · GDPR compliant · Verification run in France
We had a 12% bounce rate on our list of 80,000 contacts. Gmail was sending us to spam. After the mailcheck cleaning, we dropped to 1.2% and our open rates jumped 34% in two weeks. The ROI is obvious.
I had inherited a list of 200K leads through an acquisition. 28% were invalid. mailcheck identified them in 8 minutes. I saved directly on my Brevo bill and avoided a blacklist that would have killed my launch campaign.
I run a solo e-commerce shop and had never cleaned my list in 3 years. The interface is really simple, no technical skills required. In 15 minutes, my list was clean and my newsletters finally land in the primary inbox.
No credit card. Setup in 3 minutes. Immediate results.