We use Rackspace web mail and when trying to add IP addresses above, th

We use Rackspace web mail and when trying to add IP addresses above, the window says that the IP address is not valid.

Please assist further. I am not a technician and I do not understand what I am doing incorrectly.

Dr. Brons

Are you getting the error with all the IP addresses mentioned in the guide? If not, could you please specify with what IP addresses you are facing the issue? May we know the steps that you followed?