To prevent spam from being delivered directly to your server, we strongly recommend that you allow incoming mail traffic only from our IP address ranges.
For German customers:
Range: 83.246.65.0/24 with subnet mask 255.255.255.0, corresponds to 83.246.65.1 to 83.246.65.255
Range: 94.100.128.0/20 with subnet mask 255.255.240.0, corresponds to 94.100.128.1 to 94.100.143.255
Range: 173.45.18.0/24 with subnet mask 255.255.255.0, corresponds to 173.45.18.1 to 173.45.18.255
For European customers outside Germany:
Range: 83.246.65.0/24 with subnet mask 255.255.255.0, corresponding to addresses between 83.246.65.1 and 83.246.65.255
Range: 94.100.128.0/20 with subnet mask 255.255.240.0, corresponding to addresses between 94.100.128.1 and 94.100.143.255
Range: 185.140.204.0/22 with subnet mask 255.255.252.0, corresponding to addresses between 185.140.204.1 and 185.140.207.255
Range: 173.45.18.0/24 with subnet mask 255.255.255.0, corresponding to addresses between 173.45.18.1 and 173.45.18.255
For American customers:
Range: 83.246.65.0/24 with subnet mask 255.255.255.0, corresponding to addresses between 83.246.65.1 and 83.246.65.255
Range: 94.100.128.0/20 with subnet mask 255.255.240.0, corresponding to addresses between 94.100.128.1 and 94.100.143.255
Range: 185.140.204.0/22 with subnet mask 255.255.252.0, corresponding to addresses between 185.140.204.1 and 185.140.207.255
Range: 173.45.18.0/24 with subnet mask 255.255.255.0, corresponding to addresses between 173.45.18.1 and 173.45.18.255
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