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Network & communications
Flat
Dialogue Assets
inbox
DimGray
512x512
LightSlateGray
DodgerBlue
Bisque
Business & finance
Free Flat Business Icons
mail, Email, Address
DarkSlateBlue
Contact, mail, Message
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Mixed
Flat Design Icons (Set 1)
campaign, Email, mail
Lavender
Social media
Social Media Pro Icons
Email, mail, envelope
Orange
Micon Social Pack
envelope, Email, Message
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Flat Green
Chat, Message, Boxchat
Gainsboro
Email, inbox, Message
MidnightBlue