Microsoft Outlook: Emails encrypted with S/MIME cannot be opened. The error message "Internal error." appears.

Assume the following scenario:

  • A user receives an e-mail message encrypted with Secure/Multipurpose Internet Mail Extensions (S/MIME).
  • The message cannot be opened.
  • When opening the message, the following error message is displayed:
Unfortunately, there is a problem opening this item. This may be temporary. If this error occurs again, you should restart Outlook. Error in the underlying security system. Internal error.
Continue reading „Microsoft Outlook: Mit S/MIME verschlüsselte E-Mails können nicht geöffnet werden. Es erscheint die Fehlermeldung „Interner Fehler.““

Microsoft Outlook: Find out recipient certificates for S/MIME encrypted mails

For troubleshooting e-mail messages encrypted using Secure/Multipurpose Internet Mail Extensions (S/MIME), the encrypted part of a message can be exported. See article "Microsoft Outlook: Extracting an encrypted S/MIME message from an email„.

To find out with which certificates a message has been encrypted, you can proceed as follows...

Continue reading „Microsoft Outlook: Empfänger-Zertifikate bei S/MIME verschlüsselten Mails herausfinden“

Microsoft Outlook: Extracting an encrypted S/MIME message from an email

The encrypted part of an e-mail message encrypted with Secure/Multipurpose Internet Mail Extensions (S/MIME) is always contained in a file called "smime.p7m" as an attachment to the mail.

Outlook does not display this attachment, but it can be analyzed using the free Microsoft MFCMAPI extracted from the e-mail.

Continue reading „Microsoft Outlook: Extrahieren einer verschlüsselten S/MIME Nachricht aus einer E-Mail“

Microsoft Outlook: View which algorithm was used for an S/MIME encrypted or signed email

Below is a description of where it is possible to view which symmetric algorithm was used to encrypt an email received, and which hash algorithm was used for a signed email.

Continue reading „Microsoft Outlook: Einsehen, welcher Algorithmus für eine S/MIME verschlüsselte oder signierte E-Mail verwendet wurde“
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