PNG ICO ICNS SVG MORE
UI
Glyph
Basic interface
Email, mail, inbox
Black
512x512
Google Material Design icons
inbox
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GlyphPack
483x512
Outline
ikooni outline: Free Basic
envelope, Spam, Message
Feather
Freecns Cumulus
inbox, tray
tray, Full, inbox
download, inbox
Wirecons Free Vector Icons
Email, inbox, Full
Smooth
Snipicons
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Mimi Glyphs
16x16
PNG MORE
Pixel
Bijou
10x10
Gnome icons
48x48
3D
Crystal Clear