PNG ICO ICNS MORE
Mobile apps
Handdrawn
Web - Watercolour
Contact, mail, Address
LimeGreen
512x512
Message, Email, Letter
Black
Social media
Social Aquicons
mail, send, Message
YellowGreen
PNG ICO ICNS SVG MORE
Mixed
Social Messaging & Productivity
post, envelope, Letter
PNG ICO MORE
Jolly Icons Free – 36 Hand-Drawn UI Icons
inbox, letterhead, hand drawn
64x64
Education & science
Brainy Icons Free — 36 Science and Education Icons
submit, creative, Letter
Web Design Creatives
A, Letter
128x128
B, Letter
Letter
DarkSlateGray
Message, Letter
messege, Letter
Desktop apps
Sketchy
Letter, Autocad, A
256x256
Handy
envelope, Email, Letter
WhiteSmoke
48x48