Hello, we are extremely sorry to learn about these issues, and I'd like to help you in any way I can. Here's a full list of our error codes,
http://bit.ly/2I6BWb0. I ran your IP Address through Spamhaus, as well as another program we use for blacklists, and didn't see any blocks at all. We did make some security changes last month. As of April 24, 2019, all email sent from a Cox Email address must use TLS 1.0 security encryption or higher. As a result, Cox no longer supports sending email through email clients using SSL security encryption version 3.0 or older.
Can you please check to see if you can send and receive emails on myemail.cox.net? This is the Cox Webmail Host server. If you can send and receive emails on the host server, then I would recommend changing the password. Here is a step-by-step guide on setting up the email client server on Outlook,
http://bit.ly/2KzRtEo. Here's another list that provides the correct server settings,
http://bit.ly/2KGsVKh. Please also verify that the server name fields do NOT include east, west, or central. -Kevin M. Cox Support Forum Moderator
