[SECURITY] Fedora 12 Update: squirrelmail-1.4.20-3.fc12

SquirrelMail is a basic webmail package written in PHP4. It includes built-in pure PHP support for the IMAP and SMTP protocols, and all pages render in pure HTML 4.0 (with no JavaScript) for maximum compatibility across browsers. It has very few requirements and is very easy to configure and install.