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Instantly identify the Email Service Provider (ESP) or Secure Email Gateway (SEG) behind any domain or email list. Detect Google Workspace, Microsoft 365, Proofpoint, and Mimecast.

Verify any email address in seconds for free. Run multi-stage checks: RFC 5322 syntax validation, MX record discovery, disposable domain blacklist check, and safe SMTP handshake verification.

Check your domain’s CNAME records in real-time. Verify custom email tracking domains, CDN aliases, and subdomains to prevent broken links and tracking failures in cold outreach.

Generate a compliant DMARC record in seconds. Select policy enforcement (none, quarantine, reject), configure aggregate reporting mailboxes, set alignment strictness, and copy formatted DNS records.

Check your domain’s DMARC record in real-time. Verify policy enforcement (p=reject, quarantine, none), parse aggregate reporting (rua) tags, and ensure compliance with Google and Yahoo 2026 rules.

Generate a cryptographically secure 2048-bit RSA DKIM keypair in seconds. Download your private key for PowerMTA or Postfix, and copy the formatted DNS TXT public key record.

Check your domain’s DKIM DNS record in real-time. Verify selector resolution, parse 1024-bit vs 2048-bit RSA public keys, and ensure compliance with Google and Yahoo sender rules.

Generate a clean, RFC-compliant SPF TXT record in seconds. Select your mail relays, add dedicated PowerMTA IPs, configure softfail/hardfail policies, and copy formatted DNS records.

Check your domain’s SPF record in real-time. Validate syntax, verify mechanism formatting, and check the strict RFC 7208 10-DNS-lookup limit to prevent PermError bounces.