[Zope] Newsletter in Zope

I am looking for a way to enable a Newsletter in Zope. I want the visitors to subscribe to the newsletter. Then they receive a mail to verify the subscription. Later I can write and send a Newsletter to all subscripted visitors. Is there already a solution in Zope for that? _________________________________________________________________________ Get Your Private, Free E-mail from MSN Hotmail at http://www.hotmail.com. Share information about yourself, create your own public profile at http://profiles.msn.com.