[Bug 1902801]

[Yg-info]

For the people who are coming to this page via Google: The problem
occurs if the attachments are without MDC (which can still happen even
today). This has become a new bug report:
https://bugzilla.mozilla.org/show_bug.cgi?id=1729221

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https://bugs.launchpad.net/bugs/1902801

Title:
  Encrypted attachments cannot be opened or saved as decrypted files

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