Self Signed Certificate Exchange 2016 Problems on iPhone 11

Hey there abilino,

While you may need to contact Microsoft Support about this, or even your workplace IT Support for further help, we'd like to help by learning more about what's happening. We'd also like to rule out some possible causes:

1. You mentioned there's an issue with your email account, but what exactly is the issue occurring with it right after updating to iOS 16.4.1? The more details you provide us, the better we'll understand the issue.
2. Sometimes unexpected behavior can be resolved with a restart: Restart your iPhone
3. Have you already tried any other steps, like removing/adding back your email account as one example?

Cheers!

This is not just a Microsoft problem. It is a problem with all self signed certificates. I'm having the same problem with an IMAP server Running under Linux. There is no option to trust a self signed certificate as there used to be.

Hello abilino,

Check out the article below ands if anything ion this article help: List of available trusted root certificates in iOS 15.1, iPadOS 15.1, macOS 12.1, tvOS 15.1, and watchOS 8.1

Thanks!

Any news regarding this topic?

My own Linux NAS email server has a self-signed-certificate,

since iPhone 16.4.1 it suddenly does not longer work (same on iPad).

I have tried

• exporting the certificate on macOS as a CER file,
• installed it on the iPhone via iCloud,
• installed it in Preferences > General > VPN etc as a profile,
• trusted it in Preferences > General > Info > Certificate Trust Settings.

But even this does not help, still in Mail App I get a red certificate not trusted message,

without any ability to proceed nevertheless.

NOT working over here. Reinstalled the latest iOS, deleted all mail accounts, but can't add them again. Getting an error it's not trusted:

"Cannot Verify Server Identity. The identity of "192.168.0.***" cannot be verified"

Clicking "details" doesn't give me the option to trust the certificate. At the moment I'm lost with NO email on my phone anymore. All other Macs here (running mail) don't have this issue. If someone knows any other options I could try it could be most helpful!

dawngreg08,

I believe we are having a problem with the latest updates. Our problems are with iOS and iPadOS 16.4.1. It was fine before this.

Thanks, though.

Ron

NOW it's working.

After the above mentioned preference changes,

I've removed and re-added the email account on the iPhone.

Potentially, re-adding would have sufficed without the preferences changes.

Good work, thanks for the report! :)👍