web-based admin, esp. vistual domains?

[Robin Bowes]

Can anyone point me at any form of web-based address admin for virtual
domain users?  I'd like users who control domains to be able to easily
add/modify/delete e-mail addresses from a web-form.

Also, some sort of admin interface to setup the domains, etc would be
nice.

Has anyone done anything like this?  Or do I need to knock something
together?

R.
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