Firewall configuration

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 Spam-Filter.com IP addresses.

Spam-Filter.com utilizes three (3) data centers:

209.213.83.0/24
74.118.76.0/24
50.202.38.0/24

 


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