To remove copies of outgoing mail messages
By default, Outlook Express saves copies of the mail you send in the Sent Items folder. To save disk space, you can change this setting.
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On the Tools menu, click Options.
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On the Send tab, clear the following check box: Save copy of sent messages in the 'Sent Items' folder.
Tip
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After clearing this checkbox, you can save a copy of a message when you compose it by typing your e-mail name in the Cc box.