I found that, while it looked great, for some reason on every install I tried (granted this was a couple of years ago, but I tried on various distributions and

I found that, while it looked great, for some reason on every install I tried (granted this was a couple of years ago, but I tried on various distributions and hardware) - the mailing engine tended to silently fail - which was fairly critical. Denyhost, while not as sophisticated by a longshot, is dead easy to install and take care of the SSH brute force issue.