Do we still need anti-virus software on our systems?

While OnlyMyEmail will prevent viruses from reaching your servers through email, there are still several other vectors for infection including: web sites, instant messaging, Wi-Fi and LAN connections and/or intrusion through open ports.

This being the case, you should consider OnlyMyEmail's services as a first-step in virus protection, and not a replacement for running anti-virus applications on your network.