SnapMail for Mac

From Glass Bead Software: SnapMail is the cross-platform private messaging and file transfer utility for your office. Instantly send messages, files, reminders, and alerts on your network. Unlike instant messaging, SnapMail uses peer-to-peer technology and does not rely on Internet servers to send mail within your local network. This makes SnapMail a very fast in-house messaging system that complements your Internet email. All of your messaging can be conducted without fear of accidentally sending mail out of your company. In addition, there is no junk mail and no non-company e-mailing. You can be sure that everything in SnapMail is company business. SnapMail also connects remote offices securely across the Internet, creating a "virtual LAN".