[maestroia]

I run my business' email on a cloud VPS. It's a two step solution, with a FreeBSD host running a tightly configured Postfix as my mail gateway, and a Windows server running hMailServer (This is a great piece of Windows-based open source software. Highly recommend.).

This solutions captures the majority of spam and phishing. Occasionally, a well-crafted piece of spam gets through, and I check the Postfix config to see if I can close that hole.

What I do monitor closely are the valid emails that Postfix rejects. This happens a couple times per month, and is mainly due to the sender using GMail, and Google's mail servers being marked as sending spam.

Overall, I'm pleased with this solution. It's minimal configuration, minimal maintenance, maximum usefulness.