Stop fake emails.
Recover your ROI.
Block fake emails before they reach your CRM. Typo detection, role addresses, disposable domains — one API call. 100% sovereign, hosted in France.
Hosted in France · Zero EU data transfer · CLOUD Act-proof · DPA included
No credit card required · 100 req/month free
Or test an address right now
< 50ms
Response time
99.9%
Uptime SLA
100k+
Domains indexed
Before and after Syvel
The difference at a glance.
- ✗ Disposable emails in your CRM: every Mailchimp or Brevo send is a wasted cost
- ✗ Rising bounce rate, degraded sender score across all your campaigns
- ✗ Analytics skewed by ghost accounts, biased marketing decisions
- ✗ Dependency on US APIs: legal risk and data transfers outside the EU
- ✗ DPO under pressure, no compliance documentation available
- ✓ Zero disposable emails: every CRM contact is real, every send is profitable
- ✓ Preserved deliverability, sender score in the green across all your ESPs
- ✓ Reliable analytics, clean segments, decisions based on real data
- ✓ Full data sovereignty: hosted in France, no EU data transfer guaranteed
- ✓ Ready-to-use DPA, GDPR compliance documented and auditable at any time
Real-time DNS analysis
New domain detected
fake-mail-2026.com
Created 3 hours ago
MX lookup
MX record
mail.jetable-provider.com
Match
BLOCKED — Confirmed threat
Suspicious infrastructure · Fraudulent domain identified
Network Fingerprinting
Detect the undetectable.
Static blacklists are always lagging. Every day, hundreds of new fraudulent domains are created specifically to bypass classic filters. A list updated yesterday is already obsolete.
Syvel analyses live DNS infrastructure — MX records, SPF, DMARC, domain age, MX provider fingerprint. Not a lookup against a frozen list. A real network analysis, in real time. in real time, as soon as they appear , without waiting for manual updates to public lists.
Integration
One call. Instant answers.
A single API call returns everything: risk score, typo suggestion, reason for rejection. REST API, 99.9% uptime SLA. SDKs for Node.js and Python.
curl -X GET "https://api.syvel.io/v1/check/[email protected]" \
-H "Authorization: Bearer sv_your_api_key"{
"email": "j****[email protected]",
"is_risky": true,
"risk_score": 85,
"reason": "undeliverable",
"did_you_mean": "gmail.com",
"is_free_provider": false,
"is_corporate_email": false,
"is_alias_email": false,
"deliverability_score": 5
}Everything you need
Everything a marketing or product team needs to keep its lists clean — and its results honest.
Invisible in your stack
Live analysis, not a frozen blacklist. Integration in 3 lines of code. SDKs for Node.js and Python. Response in under 50ms.
Immediate, measurable ROI
Stop paying for fake leads. Eliminate toxic contacts before they hit your CRM. Every blocked address is a real budget recovered — and a real open rate gained.
100% Sovereign
Hosted in France. No data transfer outside the EU. Immune to the CLOUD Act. Using our competitors is a legal risk. Using Syvel is a compliance decision.
Zero PII stored
Email addresses are never stored in plain text. Only a cryptographic fingerprint is used for detection. GDPR Data Processing Agreement included. DPOs approve.
Real-time domain detection
Our engine analyses live DNS infrastructure — MX records, SPF, DMARC, domain age. New fraudulent domains caught within hours, not days.
List hygiene — built-in
Syvel catches what others miss: typos (Did you mean @gmail.com?), role-based addresses (contact@, info@, admin@) that never convert, and domains with no active mail server. One call. A cleaner, more profitable list.
Don't risk your company's compliance
with extra-European APIs.
100% sovereign. Hosted in France, no data transfer outside the EU. Immune to the CLOUD Act. Join the teams that chose Syvel.
No credit card · Cancel anytime · GDPR · CLOUD Act-proof