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UI
Flat
Metro UI Icon Set
Live, mail
DodgerBlue
512x512
SEO & web
Glyph
Metro Uinvert Dock
256x256
Mixed
Smooth
Perqui
mail, Agent
48x48
Social media
Metro UI Dock
mail, Live
All Google icons
B, mail
128x128
Lb, mail
secure, mail, Lb
Signs & symbols
Super Mono Basic
open, mail, Blue
Basic, Blue, mail
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Desktop apps
3D
Free Applications Icons
postcard, envelope, Letter
24x24
Nuvola
Folder, mail, sent
16x16