webbased email administration

[Andreas Widerøe Andersen]

Hi,
We're considering setting up an email service here and we need to give IT
admins in various companies the ability to administer their own email
addresses (under their domain).

I'm looking for software that will do this. We currently run Sendmail and
WU-POP3, but can easily change to Postfix or whatever needed.

Can anyone recommend a webbased system for administration of email adresses
that will run on FreeBSD?

Thanks,
Andreas