Google Apps Script to send third party recruiter email to spam
FilterBadRecruiters is a Google Apps Script that processes new messages looking for unwanted email from known third party recruiters. When a match is found, a reply is sent informing the sender that the message is being reported as spam and will not be read. The script then logs matches to a spreadsheet and updates a pie chart displaying what percentage of these type of messages were sent from each domain.
javascript to convert thunderbird/seamonkey filters to sieve rules
Web form that converts pasted rule set from thunderbird/seamonkey msgFilterRules.dat filter file into sieve rules suitable for uploading to an imap mail server and compatible with the sieve rule editor plugin for roundcube 'sieverules' (http://www.roundcubeforum.net/7-third-party-contributions/46-api-based-plugins/4878-sieverules-plugin.html)
Attachment Reminder is an Add-On (extension) for Mozilla Thunderbird that scans outgoing email for user-defined keywords (or just use the default list), and prompts you if it looks like you wanted to attach a file but didn't.
An open-source mail filter program with web-based tuning tool to deliver only wanted mail by using block/buddy lists and naive Bayesian statistical analysis. Gets POP3 mail. Uses php, sh, sendmail, html and javascript. Includes elaborate User Guide.
NOTICE: Keep in mind that POP3ye is alpha software and by definition it is a long way from finished.
POP3ye is a fully featured web-based e-mail client written in Object Oriented PHP 5. It ony supports the POP3 protocol.