I can confirm this as still being an issue in the latest stable version (3.1.7) as well as Mozilla Daily's Thunderbird "shredder" 3.1.9~hg20110126r5943+nobinonly-0ubuntu3~umd3~maverick.
Bug has been reported downstream (Ubuntu): https://bugs.launchpad.net/thunderbird/+bug/711314
I can confirm this as still being an issue in the latest stable version (3.1.7) as well as Mozilla Daily's Thunderbird "shredder" 3.1.9~hg2011012 6r5943+ nobinonly- 0ubuntu3~ umd3~maverick.
Bug has been reported downstream (Ubuntu): /bugs.launchpad .net/thunderbir d/+bug/ 711314
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