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Hi Cox,
I am using Outlook for Mac v. 16.6. I have always had my cox e-mail installed in Outlook and it worked fine. When I upgraded my Outlook with my new computer, I re-installed my cox e-mail. I am able to receive e-mails but not send. I have called customer service, but after checking the setting in my Outlook, they said that they couldn't help and that I would have to use the online portal to send e-mails. I was a little dumbfounded since Outlook is a major e-mail program that obviously other people are having issues with. Can you help?
Is this the "new" Outlook for Mac? If so, I think it has been confirmed not to work with Cox. Your better off either reverting Outlook or finding a new email carrier.
You provided a loopback address.
forums.cox.com/.../getting-error-code-5513-with-new-outlook-outgoing-email-fails
Ooops. Good catch, I corrected now. Basically you go to Help > Revert to Legacy Outlook.