Add-ons
Sensitivity Header 0.3 Requires Restart
by ff_bob
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.
No longer maintained: See below.
This add-on has been marked as experimental by its developers
About this Add-on
Due to changes made around the time of Thunderbird 73's release this add-on no longer functions past that version, and would need to be re-written for MailExtensions. Unfortunately due to the author's circumstances, this is not possible at this time. As the SeaMonkey browser/email suite does not use MailExtensions, it is still possible to use the addon (version 0.2) in current versions of SeaMonkey. (see www.seamonkey-project.org).
This simple addon allows the user to add a sensitivity indicator ('Personal/Private/Company-Confidential') to an outgoing message via an option in the tools menu, or from an optional drop-down toolbar menu (similar to message priority).
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:
Known Issues
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.
This simple addon allows the user to add a sensitivity indicator ('Personal/Private/Company-Confidential') to an outgoing message via an option in the tools menu, or from an optional drop-down toolbar menu (similar to message priority).
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 forwarded; 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).
Known Issues
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.
