Sending an email to all users of my system

[Roberto Samarone Ara�jo \(RSA\)]

                I would like to know how can I create an email , so when
I send a message using this email it will send a copy of it to all users in
my email system including virtual emails but , if an user try to make a
reply of this email , it only will send a email to the email that I use to
send to all user and not to all users in my server . I don't want to create
a moderated mailing list to do it .

                            Sorry for these questions ,

                                        Roberto Samarone Araujo (RSA)