Unable to verify message signature

Unable to verify message signature

Windows cannot verify the digital signature for the drivers

Apple Mail began to show the alert Unable to validate message signature above all signed and encrypted emails after upgrading from Sierra to Mojave (macOS 10.14). When you click on Information, you’ll see that we’re using S/MIME certificates signed by a self-signed root CA, but I don’t think that’s the issue. The certificates are stated to be legitimate and good when verified in the Keychain app. If I get the above message in Apple Mail and click on Show Certificate, the root certificate is listed as legitimate and trusted, but the S/MIME certificate is still invalid for no apparent reason.
When Mail is configured to not load remote content automatically (Preferences > Viewing > Load remote content in messages is unchecked), the alert message Unable to validate message signature is displayed for any S/MIME signed message.
The patch was created with the intention of preventing the Mail app from loading HTML content without the user’s permission. However, the way it is currently applied, this results in the signature attachment not being loaded as well.

Windows cannot verify the digital signature for this file

Signatures on messages are automatically checked in the browser if an email or an attachment is opened when trusted keys are available. You should check the Sender’s address to see if the message has a valid signature. A warning sign on the lock indicates an incorrect signature: If the lock has no check mark or warning sign and you have trustworthy keys, the message has no digital signature. If a message is sent and it fails authentication, only an alert symbol is shown.
Attachments can be signed in the same way that messages can. This is useful in stopping viruses from being sent to you by criminals. The signature status cannot always be seen when opening a message, unlike messages: the browser must first download the attachment before we can check it.
If there is a signature, a status icon will appear as soon as the browser has downloaded the attachment for the first time. Furthermore, the user is informed before installing the attachment if the signature failed authentication and this was not visible while pressing the download button.

Windows cannot verify the digital signature for this file

We’re running 7.5 SP 11 at the moment. We’re attempting our first AS2 setup with one of our trading partners (OpenText), and while outbound messages are successfully transmitted and the MDN is received, we’re having trouble with inbound transmission. We were able to successfully test the inbound messages from the Mendelson AS2 Client method, but when we try with a real partner and they try to send, we get the following error:
The decryption with our private key is successful, but the signature verification with their public key is unsuccessful. The irony is that we successfully check their signature and are able to submit the SYNC MDN when they send a test message from their device. This shows that the public certificate we have is legitimate. However, when they try to send the post, the signature authentication fails, despite the fact that they are using the same certificate.
We’ve reached out to the partner for more information on their config in terms of test vs real, and we’d appreciate any feedback or thoughts on this peculiar conduct. However, I assume that since Mendelson is open source, it will be versatile, and that we might be missing something on the PO side.

Signature not verified error? signature not verified

When reading mail in Apple’s Mail app, you can sometimes receive an error message that says “Unable to verify message signature.” If you press the “Display Information” button, you’ll see a message that says: If the sender is using the Mail application on a Macintosh, they can see two extra icons just to the right of the “Signature” menu when writing a message. One symbol resembles a padlock, while the other resembles a starburst balloon. The star-burst balloon will have a tiny “check-mark” in the center if Mail is set to digitally sign messages:

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