Too bad *nix is not that easy for you, one of my recent setup seems to match this, using postfix, dovecot, amavisd-new, clamav, postgrey and horde as webmail.
Anyway before that, I used to have a mailenable ( http://www.mailenable.com ) the free version worked fine, and the pro-full-enterprise-commercial-insertsomethingcatchyhere looks good.
But not tweakable enough when your starting to be ok with *nix systems ;)
But as I remember, Windows and Mailservers don't like each other so much. I used to have Atrium's mailserver and even some Exchange (blame me), and from some size, it's not just possible to keep decent performance and/or good stability.
Maybe it's time to get a *nix guy I your team ? ;)
Good luck.
Mike Kellenberger wrote:
We're looking around for a new mail server solution, since our mercur (www.atrium.de) server is just too unstable.
Preferably it should run on windows (we're just not at home on the *nix platforms), have all it's config options in a sql database, provide anti-spam and anti-virus out of the box, have a feature-rich webmail client and be tailored for a small ISP.
Our specs: ~700 Domains, ~4000 Users
Thanks in advance for all your tips!
Cheers,
Mike