More than 85% of all Internet eMail is spam, viruses or other undesirable traffic.  The constant flow of undesirable eMail traffic consumes valuable server resources, which is especially important in virtual environments.  Consequently, the flow of abusive traffic decreases performance for authenticated users, quickly fills disk space and increases bandwidth usage.  It also wastes CPU resources because spam filtering engines are always running and must process every message.  This reduces the servers ability to respond to your other running applications.

CNS GateKeeper is a managed SMTP proxy to filter unwanted email traffic from the Internet to your mail server.  Configured between the Internet and your mail server as a SMTP proxy, all spam and virus filtering is off-loaded to the GateKeeper managed service.  This makes more server resources available to applications because the server is not also working to keep out undesirable email traffic.

Your eMail subscribers will enjoy a MS Outlook toolbar to report spam and adjust their white lists. Reports can also be filed by forwarding messages as attachments to respective eMail addresses.

GateKeeper is available for in-house mail servers and virtual/dedicated servers.  GateKeeper for VPS or Dedicated customers is billed at a low monthly rate.  GateKeeper for mail servers hosted outside the CNS network is billed by users.

We assign your GateKeeper subscription a public IP address to use as the MX record and change your servers SMTP primary port away from 25, so that foreign mail servers can not connect.  Your authenticated users will continue to connect to your mail server as usual, using port 587, but unauthenticated Internet mail will be routed through the GateKeeper service and on to your SMTP server.  Your mail server is also configured to smart-host messages back out through the GateKeeper service so that GK can analyze your outgoing mail and update the spam and whitelist database.  Domains hosted on our DNS area automatically added.  If your domain is not hosted on the CNS DNS then you will need to be sure and update us with any new domains so that your filter can be adjusted.