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UI
Glyph
Basic interface
Email, mail, inbox
Black
512x512
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Elysium Icons
mail, Email, inbox
DimGray
24x24
Google Material Design icons
inbox
PNG SVG MORE
GlyphPack
483x512
Outline
ikooni outline: Free Basic
envelope, Spam, Message
Free basic
envelope, Message, Rss
CadetBlue
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
Pixel
Bijou
10x10
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Super Mono Stickers
sticker, inbox
DarkSlateGray
64x64
Fugue Icons
inbox, upload
SteelBlue
download, upload, inbox
Boolean
LightSteelBlue
Full, inbox
inbox, exclamation
BurlyWood
inbox, Arrow