Assuming Outlook Expresss:
View | All headers | Place the Group name in BCC field.
NB: Your ISP may require an address in the TO field so put your own there,
to be safe (and so that the recipients will know who sent the message).
--
OE-specific newsgroup:
news://msnews.microsoft.com/microsoft.public.outlookexpress.general
~Robear Dyer (PA Bear)
MS MVP-IE, Mail, Security, Windows Desktop Experience - since 2002