SPF Record Syntax: Mechanisms, Qualifiers, Modifiers, and Macros SPF & DKIM & DMARC DNS Email Security Q: 8 R: 9 Aug 3, 2026 Summary
What DMARC Actually Protects You From, and What It Does Not SPF & DKIM & DMARC Email Security DNS Q: 8 R: 9 Aug 3, 2026 Summary
DMARC Has Been Public Since 2012. 68.4% of Company Domains Still Don't Enforce It SPF & DKIM & DMARC DNS Email Security Q: 7 R: 9 Jul 28, 2026 Summary
Classic WTF: Server Room Fans and More Fun IT Management SPF & DKIM & DMARC Q: 6 R: 7 Jul 22, 2026 Summary
PCI DSS DMARC Requirement: What Section 5.4.1 Requires (and What It Doesn’t) SPF & DKIM & DMARC Email Security Compliance Q: 7 R: 9 Jul 24, 2026 Summary
You should self-host your mail (in 2026) SPF & DKIM & DMARC DNS Anti-spam Q: 8 R: 9 Jul 23, 2026 Summary
DKIM2 and DMARCbis have landed, and Stalwart speaks them first SPF & DKIM & DMARC Email Security Q: 8 R: 9 Jul 6, 2026 Summary
DKIM2 and DMARCbis have landed, and Stalwart speaks them first SPF & DKIM & DMARC Email Security DNS Q: 8 R: 9 Jul 8, 2026 Summary
Why DMARC's new "np" tag can fail with DNSSEC SPF & DKIM & DMARC DNSSEC DNS Q: 8 R: 9 Jul 5, 2026 Summary
Self-hosting email the hard way from your own routable IPv4 block up SPF & DKIM & DMARC DNS Email Deliverability Q: 9 R: 9 Jun 8, 2026 Summary
How do I get SEO Email Spam to stop? Anti-spam Email Security SPF & DKIM & DMARC Q: 8 R: 9 Jun 8, 2026 Summary
B Danish Pension Blacklists SpaceX over 'Catastrophic Governance' Phishing & Social Engineering Email Security SPF & DKIM & DMARC Q: 8 R: 9 May 29, 2026 Summary
Show HN: Posthorn, self-hosted mail without the mail server Email Deliverability Email Security SPF & DKIM & DMARC Q: 8 R: 9 May 27, 2026 Summary
OpenSMTPD Is The Mail Server For The Future SPF & DKIM & DMARC Email Security DNS Q: 9 R: 9 May 20, 2026 Summary
Mode collapse has a name, and he's selling cancer treatment advice on Amazon SPF & DKIM & DMARC Phishing & Social Engineering LLM & Prompting Q: 8 R: 9 May 16, 2026 Summary
e2a — Email for AI agents Email Security SPF & DKIM & DMARC Open Source Q: 8 R: 9 May 11, 2026 Summary