Ip Reputation

• Allow list: A list of external email addresses, IP addresses and domains trusted by the entire organisation or individual users.
• You can sometimes track spammers to particular ip addresses that they use (for sending mail or for maintaining websites); you can then use whois lookups to determine the owners of the netblocks in which these addresses appear, and then report the abuse to these parties, or to the upstream provider responsible for having sold the block.
• An open socks proxy is a security hole used by spammers to hide their originating ip address.
• A netblock is a group of IP addresses assigned to a single individual, company, or institution.
• A host is a computer that has a connection to an IP network and can provide various network services.
• It is also the name of a command on Unix operating systems that can perform DNS lookups to get the IP address associated with a host name or alias (or vice-versa).
• Isps which are slow to react to spam complaints can thus find large swaths of ip address space permanently damaged.
• An open Socks proxy is a security hole used by spammers to hide their originating IP address.
• Whois is a basic network utility that is typically used to find out who has registered for the use of a particular network domain name or who controls a particular numeric IP address.
• Persons or organizations that register for the use of domain names or IP address blocks are required to provide identifying information about themselves and this information is published in the whois databases, which is accessible to the public via software.
• You can block ip addresses or e-mail addresses of known spammers.
• The IP address is independent of any host names or domain names that a machine might have; the linkage between addresses and names is maintained in the domain name service (DNS).

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