[Dovecot] adding new user to dovecot

[Kartik Vaidyanathan]

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 Hi,
Thanks a lot for the mails.Well one major doubt that was prevailing was that do i need to create a system account for each person in order to send/receive mails, and from both(Sven Kirmess & Johannes Berg ) your mails i gather it is a must.

But Is there a workaround to this?

I have actually configured dovecot because i required a mail server in order to build a mailing list manager.A mail list manager is something in the likes of yahoogroups, where each group in my case must have a mailbox.

1. I am using Debian OS. 
The software that i am creating , which is going developed in JSP, will take a new users name and password and create a account for him by executing a shell script in my linux machine.I assume yahoo also does something similar to this to create new mail boxes for any new user.Please correct me if i am wrong.

In fact this very mail that i have received from you is because i have subscribed to the dovecott mailing list. How do you think dovecott has been able to accomplish this. Is it not because that dovecott has a mailbox in the group name "dovecott" in some system, that internally does the sending of mails to all those in the groups refering to some database.

2.Will the mail server support me in anyway by giving me some functionality to add users, thereby creating maildir's (imap) for the users.

3.Dont I need to know the admin login and passwd, to create users?

3.Lastly i know this is not that prevalent a question -> I was told mail man does a similar job as to what my software will do.Do you know how mailman works (or even yahoogroups)?.

Please enlighten me on the above issues. 
Thanks a lot for you time.

Regards 
Kartik