Outgoing Email Problems

I've had same issues with WIN7 and Outlook for over 1 week, ever since COX required changes to the settings. Previous to that I've used Outlook successfully for more than 20 years. I have made all necessary setting changes, and tried every variation of settings. Outgoing email still does not work. with an error stating The following recipient(s) cannot be reached: "Name@server.com" on date, time 550 5.1.1 relaying not allowed. Whatever this means Numerous Online Chat and Phone tech support. calls could not resolve the issue. Today tech support told me that I need to contact Microsoft Outlook and explain the problem to them as it is not a COX issue. This is definitely a COX issue. No where on COX's website do they acknowledge the issue or state there is a problem and. Turns out this same issue is happening to other 3rd email providers that COX says they support. I was so frustrated I talked to the business office and requested that they reduce my bill for the time I've spent trying to resolve this issue. There is still no resolution in sight. Good luck to everyone that is experiencing this same problem.