Never Run Out Of Buyers To Sell To.
500M+
Contacts
60M+
Mobile Numbers
50M+
Companies
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Powerful Email Verification, Built for Accuracy and Scale

ReachStream Email Verifier gives you everything you need to validate email addresses in real time, reduce bounce rates, and maintain high-quality data across your workflow.

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Global deliverabilityLive

Trusted by Companies

From fast-scaling startups to enterprise revenue teams, companies rely on ReachStream to find, verify, and convert high-quality B2B contacts faster.

Every Check Your Email List Needs, in One Verifier

  1. Real-Time Email Verification

    Verify email addresses instantly using SMTP-level validation.

    • Immediate results
    • No email sent
    • Works for any domain

  2. Bulk Email Verification

    Upload large email lists and clean them in minutes.

    • CSV upload
    • High-speed processing
    • Detailed status breakdown

  3. Multi-Attempt Verification

    Improve accuracy with intelligent retry logic.

    • Multiple verification attempts
    • Better results for complex domains
    • Reduced false negatives

  4. Detailed Email Statuses

    Make smarter decisions with clear classifications.

    • Valid
    • Invalid
    • Risky
    • Unknown
    • Do Not Mail

  5. Verification History & Reporting

    Track and manage all your verification activity.

    • File-level insights
    • Status breakdown
    • Easy re-verification

  6. High-Performance Infrastructure

    Built to handle verification at scale.

    • Distributed servers
    • Rotating IP infrastructure
    • High throughput processing

  7. Secure & Compliant

    Your data is handled with care.

    • No email sending
    • Privacy-focused processing
    • Secure infrastructure

Catch-All Resolver

New

Stop guessing on Catch-All and Risky emails. Resolve them.

Run a deeper verification on every Catch-All and Risky result, see which addresses are likely deliverable, and send with confidence instead of deleting real leads.

  • Recover real contacts hidden inside catch-all domains
  • Remove likely bounces before your campaign goes out
  • Resolve results inside Email Verifier, with no extra tools
Resolve My Emails

Verify Emails Inside Claude with the MCP Connector

Verify email addresses without leaving Claude. Connect the ReachStream EmailVerifier connector, use your own account and credits, and get results from the same API that powers your dashboard. No switching between tools.

Sign in with your own ReachStream account via OAuth 2.1 with PKCE. No shared API key needed.

Read the MCP Connector Docs
Claude Code

claude mcp add --transport http "ReachStream EmailVerifier" https://emailverifier-mcp.reachstream.com/mcp

  • Verify one or many emails
  • Get a result by request ID
  • Check multiple results in one call
Server URL https://emailverifier-mcp.reachstream.com/mcp

In Claude Desktop, open Settings, go to Connectors, add the server URL, and click Authenticate.

Over 1,000 Companies Trust ReachStream to Power Their Outreach

Verify emails in real-time, reduce bounce rates, and protect your sender reputation with industry-grade accuracy.

Trusted Security & Compliance Standards

We maintain rigorous security certifications and comply with major global data protection standards to keep your business data safe.

  • ISO 27001:2022
  • SOC 2 Type II
  • D6Nyjraaa=GDPR Compliant
  • JiadizaaaPIPEDA Compliant
  • J9Zrfibos1Ysamwat5Gcqynwbtiorv84Cbm2Qtogaaa=DPDPA Compliant
  • CCPA Compliant

Start Verifying Emails with Confidence

Get started with free credits and experience fast, reliable email verification.

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