Ip Reputation Service Exchange

• 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.
• It can return the IP addresses of host names or aliases that are submitted to it.
• The IP address returned by an authoritative name server for a given host name or alias is called the authoritative address.
• GRE and IPIP Tunneling is a technique used to connect two masqueraded networks together.
• Block List: A publicised list, usually commercial, of ip addresses known to be sources of spam.
• A block list is also a feature of anti-spam software that allows users to designate ip addresses, domain names and individual email addresses from which no mail will be accepted.
• Routing filters look for evidence like forged header lines, or IP addresses known to have been spam sources.
• 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.
• Allow list: A list of external email addresses, IP addresses and domains trusted by the entire organisation or individual users.
• IP (internet protocol) is the set of communications procedures (officially defined in IETF RFC 791) that underlie the internet.
• IP provides for the transfer of packets of data between computers on large networks.
• Additional "higher-level" protocols (such as TCP, HTTP, and SMTP) work with IP to define what these packets must look like and how they are to be processed once received.
• Dns blocklist: A list of ip addresses which are listed for spam or spam support.

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