UserCheck
UserCheck is a real-time email validation API that detects and blocks disposable, temporary, and suspicious email addresses and domains so tools can focus on genuine users and reduce fake sign-ups and abuse. It verifies whether an email or domain is valid, active, and trustworthy, checks domain reputation, identifies public email providers, relays, role accounts, and offers smart suggestions for common typos, syntax validation, and bulk processing of large lists. UserCheck continuously updates its disposable email database and enhanced validation rules, and it integrates seamlessly via a simple REST API with predictable JSON responses for efficient, low-latency verification workflows. It scales to handle high volumes of requests without performance degradation and offers organizational features like environment separation for development, staging, and production workflows. Additional capabilities include custom blocklists, webhooks, and integrations with tools.
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1Lookup
1Lookup is an enterprise-grade data verification and intelligence platform that gives businesses real-time, high-accuracy validation for phone numbers, email addresses, and IP addresses through a unified API, helping ensure data quality, reduce fraud, and protect user experiences. It aggregates data from authoritative sources, including carrier networks, FCC databases, and global threat feeds, with daily updates to deliver sub-second verification results that detect invalid, risky, or fraudulent identities, improve deliverability, and flag disposable or suspicious contact data. The core services include phone validation with HLR and carrier lookup, phone spam and risk detection, email address validation with SMTP checks and disposable domain screening, and IP intelligence for precise geolocation, proxy/VPN detection, and risk scoring, all accessible via modern REST API calls that scale to millions of daily lookups without rate limits.
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Reoon Email Verifier
One of the most accurate email validation services that cleans invalid, temporary & unsafe email addresses. Reoon can verify the most difficult email domains, including Gmail, Yahoo, Microsoft, AOL and Custom Domains with 99% accuracy. With Reoon Email Verifier you can:
1. Verify emails from Gmail, Yahoo, Microsoft, AOL and other domains.
2. Validate email addresses in bulk without sending any emails.
3. Clean up email lists with great accuracy (99%).
4. Detect dynamically changing temporary/disposable addresses.
5. Significantly reduce the bounce rate of email campaigns.
Unique things about Reoon Email Verifier:
1. Can detect soft bounces like storage full or account disabled on Gmail etc.
2. Can detect temporary emails dynamically to catch the latest domains.
3. Quick API Validation can verify emails live within 0.5 seconds.
It's a web application and runs on Reoon's server. Users can access and use this from any web browser.
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Trueguard
Trueguard identifies suspicious and fake emails at signup. Identify if the user's email is suspicious or temporary by detecting email quality, checking against our domain database & AI matching. Analyze your user's IP addresses to determine if they originate from suspicious sources like a VPN or proxy.
Trueguard features:
- Email Intelligence
- Proxy & VPN Detection
- Device Fingerprinting
- AI Scoring
- Geolocation
- Rules Engine
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