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Computer & hardware
Smooth
Crystal Project
reply all, mail
WhiteSmoke
256x256
Email, reply, mail
mail, replyall
send, mail
Photography & graphic design
3D
Dark Glass
post, Forward, mail
128x128
mail, post office, mail box
mail, reply
mail
Business & finance
SEM Labs
48x48
UI
Pixel
Fugue Icons
mail, exclamation
16x16
Minus, mail
Crystal Clear
Mini
post, envelope, mail