iOS 26 - S/MIME Encryption / Certificates

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iOS 26 - S/MIME Encryption / Certificates

Hi everyone. Since the update to iOS 26, we are no longer able to tap the person's name and view the certificate of a signed email and choose to install the certificate or remove it. This has always worked just fine but seems to be broken on iOS 26. The part that is strange is it does work just fine on an iPad running iPad OS 26.

This makes it impossible to send encrypted emails to someone via the mail app on an iPhone. I have found a temporary workaround which is to install Outlook for iOS and install the certificates through that app which then allows me to send encrypted emails via Outlook.

This appears to be a bug just with the iPhone as I have also seen a few other people online talking about the same problem. Has anyone found a solution to this?

[Edited by Moderator]

iPhone 17 Pro Max

Posted on Sep 28, 2025 11:12 AM

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Answer 1

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gulfstream5 Author

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Oct 6, 2025 10:12 PM in response to gulfstream5

I have been talking to an individual on here, https://forums.macrumors.com/threads/s-mime-ios-26.2467497/?post=34185551#post-34185551 and they discovered that messing with the contact card allows the certificate to appear. I confirmed that even editing the contact to include a space in the notes, or pretty much any edit then works. Great find from this user!

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Answer 2

gulfstream5 Author

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11 points

Sep 29, 2025 3:00 PM in response to gulfstream5

I have updated my devices to the latest iOS 26.0.1 and the problem remains.

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