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Cisco Bug: CSCvv43278 - "Outlook: Message has been tampered" warning seen for smime messages,when detached is used for sign

Last Modified

Aug 27, 2020

Products (1)

  • Cisco Email Security Appliance

Known Affected Releases

11.0.2-037 11.1.0-131 13.0.0-392

Description (partial)

Receiving email client may show "Message has been tampered" , "The message contents may have been altered" or similar notification (depending on the mail client) for S/MIME signed messages.

This issue typically occurs on outbound emails from Outlook client sent through ESA and get S/MIME signed on ESA in detached mode when viewing the message in Outlook at the recipient side. If other mail clients are used e.g. Thunderbird (for sending and/or viewing message) this issue does not occur. If ESA is skipped and Email is signed by Outlook this issue does not occur.
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