I would suggest the following improvements: * "Use the whole Address-Book for Auto-Complete": Make this a option in settings. This is useful for corporate, groups and other likes since you may don't know a specific mail/name or other field but instead a group or company name. Maybe even allow to select the used fields for auto-complete to give the user more control. * "Simpler AutoComplete": Writing a few letters then TAB opens the auto complete List allowing us to browse with UP & DOWN keys. ENTER pastes the value to composer. ESC closes the Auto-Complete. Imho TAB should also act as ENTER if a valid item was selected. That way you could quickly insert addresses! Right now it closes the Auto-Complete (I really miss this feature - coming from Thunderbird - This could help making the transition smother) Related Tickets: http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=2005 http://www.thewildbeast.co.uk/claws-mail/bugzilla/show_bug.cgi?id=2475