To keep the names and e-mail addresses of people included on a personal distribution list private, or hidden, use the Bcc field.
Notes:
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It's not possible to display the distribution list name in the To box without allowing recipients to expand it and show the entire list of names and e-mail addresses.
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The following procedure will use the sender's name/address in the To box and the distribution list will be kept hidden in the Bcc box.
Add the Bcc box to your email if it isn't there already
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In an open message, on the Message Options or Options tab, in the Fields or Show Fields group, click Show Bcc or Bcc.
Hide the distribution list in the Bcc box
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In an open message, add your e-mail address in the To box.
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In the Bcc box, add the distribution list.
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Type your message and click Send.
For information about creating a contact group or distribution list, go to Create a contact group or distribution list in Outlook.