Moving from Posterous

Hi Support,

I am setting up a website for a community that is currently using Posterous to communicate. Since Posterous was bought by twitter they are now shutting it down and I would like to move the community to this buddy press website instead.

Is there a plugin or feature that you can suggest I use to replace Posterous. It basically acted like a google group, where people can post to it and it would send an email out with the post.

Any instructions and guidance to this effect would be very cool to have.

Best Regards,

Mark