Delete or turn off your message history - Computer
Google Apps - How To Disable Chat History and Force Off Feb 05, 2012 How to Disable Gmail Chat Without Disable Gmail for a Network Disable chat in Your Gmail Account In order to disable this feature on your Gmail account follow the steps below. Log in to your Gmail account. Click on the status as shown in the image below; Click on the option "sign out of chat" This step cannot disable Google Hangouts for a network but it can just disable this feature in the specific account. Google Hangouts: Turn Off and Delete Chat History Jun 20, 2013 How to Disable the Spam Filter in Gmail - TechSwift
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Delete or turn off your message history - Computer Turn Hangout history on or off. When you turn your history on or off, it changes for everyone in the conversation. A notification appears in the Hangout window. On your computer, go to Hangouts at hangouts.google.com or in Gmail. Open a conversation. At the top, click Settings. Check or uncheck "Conversation history." Checked: History is turned