If you have enabled dark mode or the Office design "Black" in the Outlook options and display an email in Outlook sent by DRACOON, the email is displayed incorrectly. For example, the DRACOON logo is hardly recognizable.
In Outlook, in the window where the email is displayed, click the sun button:
This will display the email as intended in the original, making the previously hidden elements visible again.
This is possible under both Outlook for Windows and Outlook for Mac.
This problem occurs because Outlook in dark mode or in the Office design "Black" by default changes the colors of emails, changing the white background into a deep dark gray, for example. As a result, dark graphic elements like the DRACOON logo, which Outlook does not automatically invert, are hardly recognizable.