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• Domain name service (DNS) is a distributed database, accessible everywhere on the public internet, that can convert or resolve host name references to IP addresses (or vice-versa), identify mail exchanger hosts for a domain, and provide other useful features.
• Blocklist: A database of ip addresses or web urls suspected of being involved in spam or other abuse; generally a blocklist is not used by end-users, but is instead queried by mail hosts in order to reject or mark probable spam messages upon delivery.
• the domain name system allows the association of a domain name with an ip address of equipment in the internet network.
• Since the numeric ip address of the sending host is known to the receiving host (it comes from the basic ip socket transaction), it can be matched to the helo name using dns lookups; if the match fails, it's pretty conclusive evidence of header forgery.
• A nslookup is an IP networking utility that can query the domain name service to find out what IP address is associated with a given host name or vice-versa.
• Routing filters look for evidence like forged header lines, or ip addresses known to have been spam sources.
• This differs from a block list in that it actively boycotts tcp/ip addresses known to send spam or host spammers.
• A blocklist is a database of IP addresses suspected of being involved in spam or other abuse.
• Socks is a networking proxy protocol that enables hosts on one side of a SOCKS server to gain full access to hosts on the other side of the SOCKS server without requiring direct IP-reachability.
• 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).
• When the mail host queries a DNSBL for a particular host name or address, it receives not an IP address, but a coded answer resembling an IP address.

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