Unless the user is connecting to an Exchange server (where the DL is on the
server) or perhaps some other mail server with the same function, a
client-side DL won't hide the addresses from the recipients. It will
auto-expand after sending.

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Jocelyn Fiorello
MVP - Outlook
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> Either create a distribution list (containing all the recipients) or
> place everyone in the BCC field.
[quoted text clipped - 3 lines]
> > How do I hide all email address so other can't see who you are sending
> > to