This article describes the major changes in Thunderbird version 11. For a complete list of bugs that have been resolved in the release, refer to the list of changes in Bugzilla

User interface changes

In Thunderbird 11, the layout has been altered to move the tabs from below the main toolbar to above the main toolbar.

The image "Tabs on Top (local folders)" does not exist.

This is part of a larger project to refresh the Thunderbird user interface, and makes it possible to improve the context sensitivity of the toolbar.

New spam header providers

Various organizations offer services for analyzing messages for spam. When a message is analyzed by one of these organizations, the organization adds an additional "header" to the message. For each of your email accounts, you can specify an organization whose headers Thunderbird should "trust".

For example, if you use SpamAssassin to analyze your incoming messages, you can configure Thunderbird to designate messages as spam based on the headers added by SpamAssassin.

To configure the organization that Thunderbird will trust:

• Select ToolsEdit | Account Settings | <account name> | Junk Settings.
• Check Trust junk mail headers set by.
• Select the desired organization from the drop-down list. You can choose among:
  • Bogofilter *
  • DSPAM *
  • POPFile *
  • SpamAssassin
  • SpamPal

(*) New providers added in Thunderbird 11