Knowledge Base

Learn how to achieve DMARC compliance for Verified Mark Certificates (VMC). This guide explains DMARC, its importance for email security, and step-by-step instructions for configuring SPF, DKIM, and DMARC records.

Learn how to resolve SSL/TLS certificate errors caused by incomplete chains. Understand why intermediate certificates matter, how to verify your chain, and best practices for secure configurations.

Access New Sectigo Public Certificate Chain

This article provides details about Intermediate Certificates, such as; who issues them, who sends them, how to install, and links to download them.

WHOIS Email DCV Deprecation

Understanding Certificate Transparency (CT) Logs and Precertificates

Enterprise Public Key Infrastructure (E-PKI) Manager User guide

This article lists Sectigo's four modern root certificates, explains how they are cross-signed for backward compatibility, and notes the new roots Sectigo is introducing.

Sectigo customers request a Verified Mark Certificate (VMC) through the Sectigo shopping page and a guided certificate ordering wizard.

Format your brand logo to meet VMC requirements — the logo must be in SVG Tiny PS profile and follow specific size, shape, and color rules so email clients can display it next to your sender's name.