Support - No-IP Support Center
I have the Backup MX or Reflector Service, which ip addresses should I use for an SPF record?
If you are using the Backup MX or Reflector service. You may want to also add our mail server IP addresses to your SPF records. This would be in addition to the IP addresses of your mail servers IPs. Our mail server IP addresses are:
204.16.252.100
69.65.5.110
69.65.5.113
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