You'll inevitably have a higher failure rate running your own as I do. Gmail has millions of people contributing to its statistical analysis. You'll have yourse

You'll inevitably have a higher failure rate running your own as I do. Gmail has millions of people contributing to its statistical analysis. You'll have yourself and maybe some friends and family, at best, training the bayesian filter, and periodic updates of static rules from the project's volunteers. A combination of SA and Spamhaus's zen and dbl blocklists catches the vast majority of spam coming into my server, but I still usually end up with at least a few per day on average. I can go weeks without looking at the server at all. But when something does go wrong it can take some time. Right now I'm trying to figure out why SA has started silently dropping certain messages to certain addresses after it figures out they're not spam, rather than piping them back into Postfix as it should. This is obviously not good.