Yahoo Group like Email to Forum

Hi This project will be like yahoogroups where a user would be able to send email to forum and forum to email. Actually it will be bit different from yahoo groups as it will act like a full portal but main concentration will be on Email to Forums and Forums to Emails: This portal forum should be consisted of different forums with different email addresses: e.g. a user wishes to subscribe for section A (I mean forum A) and B but not to C and D, he should be able to send and reply to posts in section A and B from his email and on the forums itself whenever message will be posted either from email or from forum it should add and orgaize itself into some good orgainsed way so that members would be able to search these post or information inside them without any difficult but not like in some confused way like on yahoogroups where finding anything is terrible. I mean e.g. I send message from my Email to Section A with an attachment of word file. the message should add itself onto forum in Section A under section A only and should also go to all subscribers of section A on emails and file should also go automatically to a file folder with name section A on the website and link remains on to the forum post instead of the whole file there to avoid double files on the website. I hope your are understanding the project, its just a sort of an advanced copy of yahoogroups. budget is $30-100 but we welcome your ideas and quotes.