Is there any implimintation of virtual domain email configuration with postfix that would allow each individual user that owns a particular domain for which they have virtual mail for, to configure the users and mailboxes themselves?

the easiest way is to add a user then make the user not able to ssh or ftp into the box. This will create the maildir and creditials.

What the original poster is asking for is virtual mailboxes and a back-end for storing user information (other than in /etc/passwd) -- covered at:

http://www.postfix.org/VIRTUAL_README.html#virtual_mailbox

Works great.

I've used that stuff before. Only caveat is that you'd also want to write some kind of front-end to administer the setup including setting up appropriate protections. Especially if you let end users create/edit/delete usernames in your directory or database server setup.

You can use any of the back-ends available for virtual mailbox support -- DBM, MySQL, LDAP, flat files, etc. Pick whichever one you're comfortable with administering.

I would strongly recommend something other than /etc/passwd or flat files. LDAP or MySQL would probably be a better choice since you can enforce more fine-grained permissions for create/edit/delete.

It's better than hacks like filesystem ACLs which would still leave you vulnerable to users touching other domains' users account information.

Virtualmin for Webmin works great for this. You can set up or import a virtual domain into Virtualmin, then individual domain owners can add mailboxes (you can control how many are allowed), or more login accounts if you let them.

Thanks everyone. I am thinking about using mysql as a backend. It seems a lot easier to allow users to create all sorts of virtual mailboxes.

I guess I would then create an admin page for each virtual domain account so that the owners of those domains could control their own mailboxes.