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Sensitivity Header 0.3 Requires Restart
Implement the "Sensitivity" header for outgoing messages (described in RFC 4021 section 2.1.55).
This allows the user to select Private / Personal / Company-Confidential (or none) for an outgoing message.
This add-on has been marked as experimental by its developers
About this Add-on
While adding this header does not directly add any security to the message, the header can be interpreted by some MTA/MUAs such that the message is treated differently while in transit, or when viewed by the recipient:
- e.g. MS Outlook/Exchange: Can be set so that confidential/personal messages are unable to be read by the recipient's delegated users; A warning can be displayed before the message is forwareded; Displays an advisory message above content.
- e.g. Some versions of Symantec PGP in corporate set-ups can automatically encrypt the outgoing message if leaving the corporate network, or redirect it to a secure corporate webmail page (with an automated notification email to the recipient to collect it there).
When re-opening a draft message where a sensitivity was set, the previous value is not currently retained. Similarly, when forwarding or replying to a message, the sensitivity value from the original message is not currently retained. As such, please make sure to select the correct sensitivity before sending your messages - if you add the toolbar item, this is always visible when composing. I hope to find a fix for these issues in a future version.
This addon does not currently show an indicator for received messages yet - In future versions of this addon, I may add some kind of (optional) banner above the message when the header is set to Personal/Private/Confidential. In the meantime, if the header has been set on any message, it will be visible if 'View Menu -> Headers -> All' is ticked.
If you're familiar with Thunderbird addon development and want to help out or add translations, please get in touch via https://github.com/BobSoft3000/tb-sensitivity-header/.