To cancel a posted message
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In the folder list, select the newsgroup where you posted the message, and then select your message.
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On the Compose menu, click Cancel Message.
Notes
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You can cancel only messages that you posted.
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After you cancel a message, it may take some time for it to be removed from your server and other servers on the Internet. Canceling a message does not remove it from another user's computer if the user downloaded the message before it was canceled.