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Cartoon mailbox character holding a return to sender notice. Sad expression. cancellation
Block unknown sender. Scam alert awareness and prevention
Old style cup phone with red string at the center, concept for two way communication, information transmission, sender and receiver, communicate with each other
A figure showing the cyclic process of communication which includes Sender, receiver, encoding, decoding, interpretation, channel and feedback
Close-up of woman's hand holding envelope and inserting in mailbox

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