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Business & finance
Flat
Pretty Office 9
send, Email
Gold
256x256
3D
FRESH Add-on
send, Bill, Email
Black
UI
Pixel
Fugue Icons
mail, send
SteelBlue
16x16
receive, send, mail
Computer & hardware
WooCons #1
File, send
WhiteSmoke
32x32
Boolean
send
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Files & folders
Smooth
Spirit20
Closed, send, mail
20x20
mail, Closed, send
mail, open, send
send, printer
DarkSlateGray
Gnome Web Icons
Gnome, send, document
Gray
send, mail, Gnome
LightSteelBlue
Gnome, receive, mail
send, document, 48
48x48
DarkGray
48, Gnome, receive
PNG ICO MORE
paper, send, planepaper
64x64
Gnome, 64, mail
send, 64, mail
Mixed
Bunch of Bluish Icons
send, group, Community
512x512
send, user
Photography & graphic design
Weaver Icon Set
send, mail
LightGray
128x128
Corner Stone
Gainsboro