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UI
3D
Gnome Web Icons
unread, Gnome, mail
Khaki
32x32
48, mail, Gnome
48x48
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unread, mail, 64
64x64
Pixel
Fugue Icons
open, mail
24x24
mail, open
16x16
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Crystal Clear
mail, envelope
mail, Trash, remove
Forward, mail
22x22
mail, replyall
new, mail
reply, mail
send, mail