To reproduce this behavior, I use GPG4Win on Windows. When I send an email encrypted to Zammad, the email along with attachments is displayed correctly; similarly, when I only sign it, it displays correctly as well. However, when the combination of signing and encrypting is used by the sender, the email becomes partially unreadable (umlauts, etc.), and the attachments are only shown cryptically as text within the email. I am currently informing senders about the workaround and hope that I am not the only one experiencing this issue. However, I currently lack the time to provide a proper reproduction guide, logs, etc., for GitHub. I will try to accomplish this in a timely manner.
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