I run a similar set up through Yahoo Groups for local parents, and I've got to say that I've never had any problem with protection of email addresses in almost 2 years. I set up a yahoo email address specifically for that group and I get no junk whatsoever. People can hide their email addresses from other users in case they are concerned about other group members misusing. There are several delivery options, from the user checking through the website, to special notices only, to daily email digest to each posted message being sent to users by email.
The sign up process to yahoo isn't great, but once you are on it's really easy to use, including pics and files etc.
Hope this is some help; any more questions about it, just ask!
Z
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