Note: We do not recommend whitelisting specific servers for allowing emails since their IP addresses could change at short notice and we might add additional servers as the service requires. The correct way is to check SPF/DKIM/DMARC, since the SPF record will always be updated when any details change.
White List our Mail Servers
If you must use whitelisting, and you are experiencing mail deliverability issues, you should send the following list of IP addresses to your IT department to whitelist.
| # |
Hostname |
IP |
| 1 |
ms1.ssmx.net |
91.146.104.26 |
| 2 |
ms4.ssmx.net |
108.61.174.107 |
| 3 |
ms5.ssmx.net |
45.76.132.45 |
| 4 |
ms6.ssmx.net |
45.77.58.210 |
| 5 |
ms7.ssmx.net |
45.76.140.73 |
| 6 |
ms8.ssmx.net |
45.77.59.21 |
| 7 |
ms9.ssmx.net |
45.77.56.201 |
| 8 |
ms10.ssmx.net |
45.76.143.176 |
| 9 |
s1.ssurvey.co.uk |
20.90.100.236 |
All of these IP addresses are included in the SPF record: spf.ssmx.net