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Social media
Handdrawn
Social Aquicons
mail, send, Message
YellowGreen
512x512
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Mixed
Social Messaging & Productivity
post, envelope, Letter
Black
Social - Hand Drawn Icons
envelope, hand drawn, Social
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Jolly Icons Free – 36 Hand-Drawn UI Icons
inbox, letterhead, hand drawn
64x64
Avatars & smileys
Jolly Icons — Part 1: Social Media and Communication
hand-drawn, envelope, mail
Desktop apps
Marker-Style Icons
Email, envelope
Handy
envelope, Email, Letter
WhiteSmoke
48x48
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Doodle
Email, envelope, Drawing
DarkSlateBlue
128x128