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Re:iCloud+ custom email domains should be better by domlaut on Sunday February 27, 2022 @04:57PM (#30493032)
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?

Re:iCloud+ custom email domains should be better by miken123 on Monday February 28, 2022 @06:24AM (#30498708)
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.

Re:iCloud+ custom email domains should be better by slimeboty on Sunday February 27, 2022 @07:13PM (#30494371)
Does the desktop mail app count as iCloud mail?
Re:iCloud+ custom email domains should be better by domlaut on Sunday February 27, 2022 @08:12PM (#30494899)
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.