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You're right -- this is something I missed mentioning. As of right now, it's still only the web-based iCloud Mail that makes use of DKIM. Using any other client/app will deliver your emails unsigned.

Would you mind if I updated the article crediting you for the DKIM addendum?

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I believe the webinterface signs with the icloud.com domain and not your own.

Happy for you to update the article, no need for credits.

Does the desktop mail app count as iCloud mail?

Unfortunately not, DKIM doesn't work on either Apple's desktop or iOS/iPadOS Mail.app (aka. Apple Mail). OTOH, at least they set the correct Return-Path unlike some others that leak your Apple ID through the header instead.

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