DNS, email authentication, AI integrations and product updates.
Technical guides, comparisons and insights on public DNS resolvers (Cloudflare, Google, Quad9), email authentication (SPF, DKIM, DMARC, BIMI, ARC) and deliverability. Learn how to configure Amazon SES, Brevo, SendGrid or Mailjet, and explore our AI integrations with ChatGPT and the MCP protocol. Whether you're a sysadmin, developer or marketing manager, find best practices here to secure your domains and optimize your email delivery.
Articles
GPTBot, ClaudeBot and PerplexityBot do not follow redirects like Googlebot. Understand their actual behavior to stay visible in ChatGPT, Claude and Perplexity.
Phishing targets the masses, spear phishing targets the person. In 2026, AI, OSINT, and deepfakes blur the line. Full breakdown with real cases and defenses.
HSTS (RFC 6797) forces browsers to contact your site only over HTTPS. This guide covers the protocol, the directives, per-stack configurations and how to submit to the Chrome preload list.
Cloudflare now covers 4 email layers: free Email Routing, transactional Email Service (public beta April 2026), anti-phishing Email Security (formerly Area 1), and DMARC Management. Complete guide covering architecture, DNS, Proofpoint/Mimecast comparison, and pricing.
Cisco Secure Email Cloud Gateway (CES) is Cisco's primary SaaS offering in 2026, the successor to the legacy ESA appliances inherited from Ironport. Complete guide: CES onboarding, iphmx.com MX records by region (NA/EU/APJ), SPF/DKIM/DMARC, migration from ESA to CES, 2024-2025 Gartner Magic Quadrant exit, zero-day CVE-2025-20393, comparison with Proofpoint, Mimecast, Defender and Abnormal.
Abnormal Security is an API-native ICES platform that detects BEC, VEC, and Account Takeover attacks using behavioral AI, with no MX change required. Complete guide: Attune 1.0 architecture, Proofpoint/Mimecast/Defender comparison, limitations, and DNS record audit.
Proofpoint is the enterprise SEG benchmark, used by 87 of the Fortune 100. Complete guide: Nexus AI architecture, TAP, SPF/DKIM/DMARC configuration, the 2024 EchoSpoofing incident and a comparison with Mimecast, Microsoft Defender and Abnormal Security.
Mimecast is a cloud email gateway (SEG) that intercepts all traffic via MX redirection. Full guide: architecture, SPF/DKIM/DMARC setup, Proofpoint/Abnormal Security comparison, and DNS audit.
Complete guide to obtaining and deploying a VMC or CMC certificate: CA comparison, pricing, prerequisites and free hosting.
