Articles DKIM | Blog CaptainDNS

January 2026

Diagram showing Amazon SES email sending flow with DKIM, SPF, and DMARC authentication

January 20, 2026

Amazon SES: Complete Guide to DNS Configuration and Email Authentication

Complete Amazon SES configuration with Easy DKIM, Custom MAIL FROM, strict DMARC alignment. Everything you need for optimal deliverability and GDPR compliance.

Mailjet dashboard with transactional API configuration and email authentication

January 20, 2026

Mailjet: Complete Technical Guide for Transactional Email in 2026

A comprehensive guide for developers and system admins: DKIM configuration, API v3 vs v3.1, dedicated vs shared IP, and pitfalls to avoid with Mailjet.

SendGrid dashboard with Domain Authentication and Web API v3 configuration

January 19, 2026

Twilio SendGrid: Complete Technical Guide for Transactional Email

A detailed technical guide for developers: DNS configuration (SPF, 2048-bit DKIM), Web API v3, SMTP Relay, dedicated vs shared IP, limits and webhooks.

Brevo dashboard with DKIM configuration and transactional API

January 16, 2026

Brevo (formerly Sendinblue): Technical Guide for Transactional Emailing

A comprehensive guide for developers and sysadmins: DKIM configuration, choosing between API and SMTP, technical limits, and pitfalls to avoid with Brevo.

December 2025

Illustration of the 3 CaptainDNS MCP widgets in ChatGPT

December 17, 2025

Connect CaptainDNS to ChatGPT via MCP: 3 widgets for DNS audits and deliverability

Add the CaptainDNS MCP server to ChatGPT and use 3 widgets to troubleshoot DMARC/DNS and analyze email headers without leaving the conversation.

November 2025

BIMI October 2025: lps=, ABNF, SVG/SVGZ formats and headers

November 13, 2025

BIMI Draft -11 dated 9 October 2025: what's changing and how to prepare

Revision -11 formalizes Local-Part Selectors (lps=), clarifies the discovery path, reaffirms SVG/SVGZ logos and reiterates DMARC and header requirements.

DKIM2: What's new, removals, timeline and impact

November 3, 2025

DKIM2: what's new, what's changing and key dates

Everything you need to know about DKIM2 at the end of 2025: principles, new headers, coexistence with DKIM/DMARC, the IETF draft timeline and a readiness plan.

October 2025

What Is ARC (Authenticated Received Chain)?

October 23, 2025

ARC: keeping trust in an email as it crosses intermediaries

ARC (Authenticated Received Chain) lets every relay forward, sign, and seal the authentication results it observed so the final server can decide whether to trust the message.