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Mailing group

Posted: Wed Nov 29, 2006 6:36 am
by liquid8
Hi!

I need to create a mailing group. There should be the following features in use:

- user can register to the mailing list by sending a mail to some address or by giving an e-mail address to a form and clicking register-button.

- user can leave the mailing group by sending an email with certain header to a certain address or by using a form.

- user can not send mail to the mailing group, only administrator is allowed to do this.

- when user recieves a mail from this group he can not see other users' e-mail addressess in recievers.

Any ideas about some free application / website which I could use to create this?
All suggestions are very welcome.

Thanks!