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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
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GlyphPack
483x512
Free basic
envelope, Message, Rss
CadetBlue
Freecns Cumulus
inbox, tray
tray, Full, inbox
download, inbox
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Mimi Glyphs
16x16