- Welcome to the North American Web Site for Pegasus Mail, the Internet's longest-serving PC e-mail system, and for the Mercury Mail Transport System, our comprehensive range of Internet Mail Server products. Pegasus Mail and Mercury are free products, dedicated to serving all who need them. Newsflash! NEW Pegasus Mail wins Best e-mail award NEW WinPMail v4.01 German Language module available ...www.pmail.com