Thunderbird: 40.2% 11390f4.jpg

Gmail Web client: 31.3%

Evolution: 7.5%

mutt: 5.9%

Kmail: 5.5%

Other: 4.1%

Claws: 1.6%

Alpine (pine): 1.5%

Opera: 1.2%

Sylpheed: .5%

GMX (Global Mail Exchange): .3%

Roundcube: .3%