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Anti-Spoofing & Phishing Shield • RFC 7489

DMARC Record Checker & Validator.

Analyze domain anti-phishing policies, inspect aggregate reporting mailto endpoints (rua), and verify strict enforcement for Gmail and Yahoo deliverability.

Diagnostic SpecimenRFC 7489 Tag Analyzer

What this analyzer evaluates:

DMARC prevents scammers from impersonating your domain. Sortwell inspects your record tags and grades your enforcement level:

✓Enforcement (p=reject): Confirms spoofed emails are rejected outright by receiving servers.
✓Aggregate Reporting (rua): Validates that mailto endpoints receive XML deliverability failure reports.
✓Subdomain Policy (sp): Ensures attackers cannot spoof subdomains (e.g. mail.yourdomain.com).
Knowledge & Standards

Why Google & Yahoo Mandate DMARC.

As of 2024, mailbox providers require bulk senders to publish valid DMARC records. Understand the three enforcement tiers and how to avoid delivery blocks.

What is the difference between p=none, quarantine, and reject?

• p=none (Monitoring): Emails are delivered normally. You receive failure reports, but spoofers are not stopped.

• p=quarantine (Spam folder): Unaligned messages are automatically sent to the recipient's junk/spam folder.

• p=reject (Full Protection): Unaligned messages are blocked at the gateway before ever reaching the inbox.

Where in my DNS should the DMARC record be placed?

DMARC is always published as a DNS TXT record at the subdomain _dmarc.yourdomain.com with a value starting with v=DMARC1;.

What is an rua tag and why do I need it?

The rua=mailto:[email protected] tag tells mailbox providers where to send daily aggregate XML reports about who is sending email on behalf of your domain.

Clean your entire email list with zero bounces.

Sortwell checks addresses the way a mail server would — live SMTP handshake, syntax, MX verification, and spamtrap detection.