Google offers a free mailing list management tool called Google Groups. You can make a Google Group for any purpose, sign people up for it, and email an entire list with just one email address.
This could be really cool for classes to use!
- Send out assignments & calendar items
- Engage the group in critique of ideas
- Share a class “newsletter”
- Students can share class notes
Also, did you know that Google has a portal for teachers using their tools? It’s Google for Educators. Lots of great ideas — and all their stuff is free.