M+ 1m - Download and install the M+ 1m free font family by M+ Fonts as well as test-drive and see a complete character set.
Mailwasher - Over 8 million people use MailWasher as their spam filter
Inconsolata - OSX, Productivity, Design, Typography, powerline, and Fonts
SPAMfighter - SPAMfighter and Microsoft have built the strongest and most effective anti spam filter for Outlook, Windows Live Mail, Outlook Express & Thunderbird
Bitstream Vera Sans Mono - Bitstream Vera Sans Mono Font | dafont.com
Spam Reader - Spam Reader is a free anti-spam add-on for Microsoft Outlook.