Do I need to make any changes in my firewall to use Spamdrain?

Last updated on March 2, 2021

If you use domain filtering, we recommend you to only allow Spamdrain's servers to connect to port 25 on your mail server.

This means that only the following IP addresses should be allowed to connect to TCP port 25 on your mail server:

62.75.203.192 - 62.75.203.223 (62.75.203.192/27)
85.25.217.33
85.25.218.200
85.25.217.35
85.25.74.85
85.25.207.204
85.25.207.221
85.25.207.243
85.25.217.223
85.25.237.107
188.138.41.142
188.138.102.7
188.138.41.110
188.138.75.226

85.25.79.86
85.25.79.91
85.25.79.94
85.25.79.105
85.25.79.113
85.25.79.115
85.25.79.117

209.151.154.115

209.151.149.240