What makes me laugh are bouts of actual hack attempts on my server. Every now and again it will come under attack from someone actually trying to log on via IMAP or the website using a dictionary attack. And when I say 'dictionary attack' I've seen user names like:
And one time the quite hilarious
I suppose they have to start somewhere. But my server is setup with an escalating naughty step and after three failed attempts the IP address is blocked for three months. A drop in the ocean and it doesn't do it for IPv6 but hopefully it deters a few of them.