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Check a domain's SPF and DMARC from code in 5 minutes (curl, JavaScript, Python)

Two DNS mistakes cause a lot of "why is our mail going to spam?" tickets: Two SPF records on one domain. The SPF spec allows exactly one v=spf1 TXT record.

  • Multiple SPF records cause mail to be routed to spam folder
  • DMARC record needed for domain owner's policy and reports
  • Public DNS-over-HTTPS (DoH) resolver verifies SPF and DMARC quickly

Your trace UI can hide a secret that SQLite still stores

I made a tiny trace store hide a fake token in its display. Then I opened the database through a fresh connection. The token was still there. So was a made-up confidential sentence.

  • Developer demonstrated hiding sensitive information in trace store
  • SQLite database retained token and confidential prose
  • Example highlights importance of proper logging practices

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