Build and validate SPF and DMARC TXT DNS records for Google Workspace, SendGrid & Mailgun.
Execution runs 100% locally inside the browser sandbox using HTML5 Canvas, Web Cryptography Subtle API, and Web Workers. Zero egress.
Zero network latency. Operates completely offline with zero dependencies on third-party backend servers or cloud services.
Built according to official RFC specifications, cryptographic test vectors, and enterprise-grade data transformation standards.
Type your domain name and DMARC aggregate report email address.
Toggle Google Workspace, SendGrid, or Mailgun inclusions.
Copy the generated @ and _dmarc TXT records to add to Cloudflare, Route53, or Namecheap.
~all is SoftFail (recommended during transition), while -all is HardFail (strict enforcement rejecting unauthorized mail).
It instructs recipient mail servers (Gmail, Outlook) to route unauthenticated emails to spam instead of rejecting them.
Zero-egress companion tools in the Security & Network suite
Measure cryptographic randomness, Shannon entropy (0-8 bits/byte), Chi-square test, and byte distributions.
Brute-force all 256 single-byte XOR keys with automated English frequency & chi-squared scoring.
Audit CSP, HSTS, X-Frame-Options, and security headers with OWASP grading (A+ to F).
Compare memory hardness, GPU ASIC resistance, and security parameters across KDF standards.
