Up & Coming Extensions
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Mail Redirect Requires Restart
Allow to redirect (a.k.a. "remail") mail messages to other recipients.
LookOut Requires Restart
LookOut is a plugin which allows Thunderbird to interface with Microsoft's mail tools by decoding metadata and attachments encapsulated/embedded in a TNEF encoded attachment (aka winmail.dat).
ImportExportTools Requires Restart
Adds some tools to import and export folders and messages
To create your own collections, you must have a Mozilla Add-ons account.