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Business & finance
Smooth
Primo
mail, newsletter, Compose
Gainsboro
128x128
Email, newsletter, envelope
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Desktop apps
Ciceronian
mail, Email, newsletter
59x60
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UI
Quartz
newsletter, envelope, Email
64x64
One bit
envelope, Email
48x48
Computer & hardware
Futurosoft
Email, envelope
Network & communications
Oxygen
envelope, mail
KDE Crystal Diamond
mail, open, envelope
Mixed
Vista Inspirate
mail, envelope