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Mixed
Smooth
Tango Icon Library
Sender, reply, mail
Black
512x512
All, mail, reply
WhiteSmoke
UI
Snipicons
reply, Chat
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Elegant Themes Icons
mail, reply
DarkGray
48x48
Addictive Flavour
reply, mail
Business & finance
Primo
reply, Email
Gainsboro
128x128
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Quartz
64x64
Ultimate Gnome
Linen
256x256
Computer & hardware
Crystal Project
reply
Email, reply, mail
Message, reply
22x22
Network & communications
Oxygen
File, paper, write
Lavender
Function icons
Carpelinx
Desktop apps
KDE Crystal Diamond