Most likely cox.net is rejecting your emails because you are not passing their authentication, and/or you have the wrong name for their local smtp server. Go on to their website, identify the location you are now in (they have multiple servers) log into your account, and you should be able to find the setup information that you need. If not, call their technical support.
Most likely cox.net is rejecting your emails because you are not passing their authentication, and/or you have the wrong name for their local smtp server.  Go on to their website, identify the location you are now in (they have multiple servers) log into your account, and you should be able to find the setup information that you need.  If not, call their technical support.