Built for list hygiene — never for spam.

EmailListChecker exists to make legitimate email better — cleaner lists, higher deliverability, fewer bounces. This Acceptable Use Policy (“AUP”) keeps the platform safe for everyone and protects our IP reputation, which directly protects your results. It applies to everyone who uses the Service and forms part of our Terms of Service.

The Service is built for, and welcomes:

• Verifying lists of customers, subscribers, leads, and contacts you collected with consent or another lawful basis.
• Cleaning and de-duplicating your own CRM, ESP, or marketing database.
• Real-time validation of sign-up forms to stop typos and fake addresses at the point of entry.
• Finding business contact details for legitimate B2B outreach where permitted by local law.

You must not use the Service to:

• Harvest or scrape email addresses you have no right to contact, or process lists bought from data brokers known to be non-consensual.
• Send spam — unsolicited bulk email, or any message that violates CAN-SPAM, GDPR/ePrivacy, CASL, or similar laws.
• Enable harassment, fraud, or phishing, or build lists targeting individuals to threaten, dox, or deceive them.
• Verify lists for malware, scams, or illegal goods distribution.
• Abuse the infrastructure — circumvent rate limits, probe for vulnerabilities, share credentials, or resell raw access without a reseller agreement.
• Process special-category data as the primary payload (e.g. lists defined by health, religion, or political affiliation) without a clear lawful basis.

API users must respect published rate limits and back off on 429 responses. Do not run distributed attacks against the verification endpoints, spoof source identifiers, or attempt to exhaust shared resources. We may throttle or suspend keys that threaten platform stability, with notice where practical.

We investigate suspected violations and may, depending on severity, warn you, throttle usage, suspend the offending job or key, or terminate the account. For clear, serious abuse — spam operations, fraud, illegal content — we act immediately and may report to authorities.

Seeing the Service misused, or receiving unwanted mail tied to it? Report it to [email protected] and we'll act. We take our sending reputation — and yours — seriously.