Looking for Email Suscription/List Plugin?

Hello. I’m looking for a plugin or something that will allow people to subscribe to a mailing list and email all of the people that are part of the list by writing to, lets say, “mailinglist@wordpress.org”. This would be for having group discussions through email (similar to yahoo groups).

Is there a wp plugin or something out there that will let me do this?

Thanks in advance for your time.