Firewall configuration / TEST TOOL

To prevent spam and viruses from bypassing the Spam-Filter, it's recommended (but not mandatory) to lock down the firewall of your mailserver. This means limiting SMTP (PORT:25) traffic at the firewall level to only allow connections from IP addresses. utilizes three (3) data centers:

After making the restrictions to port:25, you can use this tool to test your configuration. If successful, you should receive three (3) emails, one from each data center.

*Must be an address that is currently being protected by

Spam Filter