Sender Verification Extension

This is an extension for the Mozilla Thunderbird email application that reports, when possible, whether the Sender shown in the From: header was actually the sender of the email. In FACT, forging the From: header is possible! This is intended to be a tool to identify phishing, fradulent emails asking for your sensitive data, and Zombie-spread viruses claiming to be from someone they are not. The extension uses Sender Policy Framework (SPF) (in a nonstandard way) and DomainKeys (DK) to verify the sender`s domain, and SURBL, Spamhaus, DNSWL, and Sender Score Certified for reputation information.