[shadytrees]

Another happy mailinabox user here. I love have total control over where my data goes. If you use third-party no-installation-required server monitoring (with Pingdom or something), you can get mobile notifications if your server ever goes down, which for me has only ever happened due to kernel upgrades.

I also have no trouble sending email to Gmail users after carefully following all the steps in the manual! The only sticky point I had was that it required fancy DNS records that Namecheap doesn't support -- I think if I were doing it all over again I'd transfer domains over to a better nameserver.