How can I see if an e-mail is signed in "Mail" (using an Exchange account)?

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                          Usually, a signed message shows a checkmark icon. Clicking on this icon displays the certificate that was used to sign the message:

Not so when a message lies in an exchange mailbox, and is displayed with "Mail" on MacOS (tested up to 10.10):

The iPad, on the other hand, handles the exact same message just fine. It is also connected via Exchange protocol to the server:

So: How can I enable this also on "Mail" on OS X? Or is this a bug, or even a permanent restriction?

Asked by user89124

Aug 29, 2014, 03:53 PM
Last activity: May 19, 2018, 09:45 AM

How can I see if an e-mail is signed in "Mail" (using an Exchange account)?

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