Patent ID: 7409708

Claim:
A computer readable storage medium having stored thereon computer executable components that facilitate spam detection the components comprise: a component that receives an item and extracts a set of features associated with an origination of a message or part thereof and/or information that enables an intended recipient to contact, respond to, or act on the message, the features comprising at least one of IP address-based features and URL-based features, wherein the IP address-based features comprise at least one of presence of reverse DNS entry or domain name, hostname from the reverse DNS entry and missing reverse DNS entry; an analysis component that analyzes at least a subset of the features; and at least one filter that is trained on at least a subset of the features to facilitate distinguishing spam messages from good messages, wherein the filter is trained by analyzing at least a portion of the IP address-based data at least in part by taking null reverse DNS information and using a null RDNS entry as input into a machine learning algorithm.