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The article focuses on the creation of a user interface (UI) that warns electronic mail (email) users that they are on the blind copy list (BBC list) of an email to avoid reply. The UI reminds readers to check the recipient lists before they could reply to an email in the BBC list. The warning is presented through different color of the email or header information or an inserted text at the top of the body of the email. The UI shows the readers that they were blind copied in the text area.