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UI
Outline
Feather
inbox
Black
512x512
Social media
Flat
Micon Social Pack
envelope, Email, Message
Lavender
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Network & communications
Smooth
Chatting
inbox, Letter, mail
WhiteSmoke
Mixed
Internet and web
envelope, Message, e-mail
DarkSlateGray
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Pixel
8-Bit
post, inbox, e-mail
Glyph
Octicons
384x512
Flat Green
Chat, Message, Boxchat
Gainsboro
Email, inbox, Message
MidnightBlue
Entypo
437x512
Freecns Cumulus
inbox, tray
tray, Full, inbox
download, inbox
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Handdrawn
Jolly Icons Free – 36 Hand-Drawn UI Icons
inbox, letterhead, hand drawn
64x64
Photography & graphic design
3D
32x32 Free Design Icons
Email, Message, @
32x32
Wirecons Free Vector Icons
Email, inbox, Full
Business & finance
iOS 7 icons
Snipicons
Cartoon
Mushroom icons
inbox, Mushroom
256x256
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Mail icons
inbox, shelf
144x144
Eightyshades
Desktop apps
Farm-fresh
inbox, document, Text
Peru
document, inbox, music