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Email Verifier

Validate every email address before you send

The Email Verifier agent checks every contact's email address with MX lookup, SMTP verification, and catch-all detection — protecting your sender reputation by preventing bounces before they happen.

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Key Capabilities

MX Record Validation

Checks DNS records to confirm the recipient's mail server exists and accepts connections.

SMTP Verification

Performs mailbox-level verification without sending an email to confirm deliverability.

Catch-All Detection

Identifies domains that accept all addresses — flagging them as higher risk for bounces.

Bulk Processing

Verifies thousands of addresses in parallel with rate limiting to respect provider limits.

How It Works

  1. 1

    Import your contact list or let the Lead Finder feed verified leads.

  2. 2

    MX lookup confirms the domain's mail server is active.

  3. 3

    SMTP handshake verifies the specific mailbox exists.

  4. 4

    Results are tagged: valid, invalid, risky, or catch-all.

Technical Highlights

  • Three-stage verification: syntax → MX → SMTP
  • Concurrent verification with configurable parallelism
  • Catch-all domain detection via probe addresses
  • Result caching to avoid redundant lookups

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Set up in 3 minutes — no credit card required.

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