A document describing how to write simple procmail rules that will allow you to either avoid the spam filter for email with certain characteristics (whitelist) or automatically discard email with other characteristics (blacklist). The most common tasks are acceptance and rejection of email with specific sender addresses.

Notes on activating and configuring the local spam filter system.

An overview of the Physics anti-spam architecture.

Many people receive spam messages purporting to come from themselves or other persons they know. How does this happen?