SECTIGO CPAC Pro is displayed as not trusted in macOS Keychain (Error: "your@mail.com certificate is not trusted")

SECTIGO CPAC Pro S/MIME certificate is displayed as not trusted in macOS Keychain.

Cause: The intermediate certificate Sectigo Public Email Protection CA R36 for ECC-based keys is missing.

Solution: Install the Sectigo Public Email Protection CA R36 certificate - Download: https://crt.sh/?d=4267304694

For more information from SECTIGO / Source:
https://www.sectigo.com/knowledge-base/detail/Sectigo-Public-Root-CAs-Migration/kA0Uj0000003RoT


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