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Thunderbird

Interesting extensions

Change quote and reply format: to have a real reply header with date, sender, subject etc
Quote Colors: set different colors to different levels of reply
Image Zoom: unzoom images that do not fit in the window
Enigmail: OpenPGP encryption and authentification
Lightning: a calendar
Provider for Google Calendar
Remove duplicate messages (Alternate)
Remember mismatched domains
WebMail
Mailbox Alert: to trigger customized alerts for some folders
Profile Password
Mail redirect