Is your server well-behaving?
From Unixshell# community wiki
Is your server well-behaving?
- Are DNS settings RFC compliant and do they follow the common internet practices? http://www.dnsreport.com/
- Is your mail server an open relay? http://www.abuse.net/relay.html
- Are your TCP ports well protected by your firewall? http://www.hackerwatch.org/probe/ (to be run from inside your server)
