Sender Policy Framework records, include mechanisms, and lookup limits.
14 articles
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.
One in five emails never reaches the inbox. This guide shows you how to test your email deliverability before sending and fix every issue.
Detailed technical guide for developers: DNS configuration (DKIM, custom Return-Path), REST API vs SMTP, Message Streams, dedicated IP, webhooks and 2026 pricing.
A detailed technical guide for developers: DNS configuration (SPF, 2048-bit DKIM with autorotation), REST API vs SMTP, dedicated vs shared IP, limits and webhooks.
A detailed technical guide for developers: DNS configuration (SPF, 2048-bit DKIM), Web API v3, SMTP Relay, dedicated vs shared IP, limits and webhooks.
Add the CaptainDNS MCP server to ChatGPT and use 3 widgets to troubleshoot DMARC/DNS and analyze email headers without leaving the conversation.
