Build a Highly Accurate Email Verification Tool

[Simkk15]

Request: Design and implement a new email verification tool that provides results as accurate as or better than tools like hunter.io and verify-mail.preview.emergentagent.com.

Requirements:

• The tool should verify email addresses with the highest possible accuracy, surpassing existing solutions in reliability.
• It should perform multi-step checks:
  1. Syntax validation (RFC compliant)
  2. Domain verification (DNS and MX record checks)
  3. SMTP mailbox verification (actual existence, catch-all detection)
  4. Disposable/temporary email detection using up-to-date blocklists
  5. Optionally: Verify presence on public social profiles or data sources
• Should provide detailed result codes (valid, invalid, catch-all, disposable, unknown, etc.) and clear explanations for each result
• Must be suitable for integration into checkemails.io and provide API endpoints for real-time and batch verification
• The overall system should avoid false positives and negatives as much as possible, and handle various edge cases like greylisting, anti-spam protections, and internationalized domains

Suggested Tech:

• Use robust DNS and SMTP libraries
• Consider async processing for batch checks
• Support for webhooks or callbacks for delayed/complex results

References:

• Existing solutions: hunter.io, verify-mail.preview.emergentagent.com
• Current repo: OpenInitia/KnowEmail

This enhancement aims to deliver a market-leading email verification experience.