Monday, August 07, 2006

mail server blacklisted

Our gateway server got blacklisted on cbl.abuseat.org.

Blocked port 25 as they suggest for all NATed machines (could have viruses/spyware on them) and allowed only the legit mailserver to connect to port 25 on internal network. Checked it by using nmap with spoofed ip address of internal machine: nmap option -S

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