I'm interesting in monitoring database space usage in SQL Server 2005.
Ideally, once a day I'd like a job to run that looks for databases that are
within 20% of capacity. If one or more exists, I get an email. I don't
need/want it to monitor constantly as our business processes do not require
that. I do not want to have to manually monitor. For other business
reasons, our databases will be set to fixed size with autogrowth disabled,
hence our interest in monitoring.

What do you recommend?

Thanks,
Mark