78577 Web based email required.....

require a web based email script that will handle up to a total of 4000 users (these are approx figures). It is for a community based project and must be secure and safe. Features required :- Ability to handle 4000 users Send mailings out to users Stats on users and usage totals Ability to reserve user names, to protect certain usernames Special sign up page and area for under 16's Pron and Spam filters. (very important!) POP3 capability for future needs Send attachments Online address book Folders - Drafts, Sent and Create New ones Online Admin area 'Bad' words filter Backup facilities - Setting and emails Email footer - ability to include messages in emails. You must be able to install the script on my server, after I have seen it in action on yours. You must be able to provide support for it afterwards if required. Look forward to your bids and any question, please post in pmb and I will try to answer. Thanks for your time.