Please check out this link... http://www.google.com/apps/intl/en/group/index.html
(Standard version is free)
You can provide this as a service to your web community.
Google Apps Standard Edition helps groups build community
Could your club, family, sports team or group use an easy way to
communicate and work together online? With Google Apps Standard
Edition, you can, and even create web pages to show the world what
you're about, all for free.
Get custom email like email@example.com
Organize your schedule and share events with friends
Share online documents, presentations, and spreadsheets
Create websites and group wikis
Are you a business IT decision-maker?
Google Apps Premier Edition offers powerful messaging and collaboration apps that meet business-critical needs:
- Proven cost savings
- 99.9% uptime guarantee
- 25GB of email storage per employee
- Mobile email, calendar and IM access
- Industry-leading security
- Full administrative and data control
- Helpful support choices