Hello Mfern,
Thanks for contacting us and with the new email client we have. People were required to make changes in their Outlook settings and were required to login to our site and change your password for all changes to take affect. Please visit https://www.cox.com/residential/special-offers/secure-email.html and verify your setting, even re-entering the information if the current information appears correct already. Once all changes have been made login to myemail.cox.net and change your password. Please wait 30 minutes as the server has to process any changes prior to anything being able to process. Also verify no messages are in your outbox on all devices and if found, please move them to another folder prior to making these changes as well. If issues remain afterward, please reach us on Twitter at @CoxHelp, visit us on Facebook, or email by at cox.help@cox.com. Provide us the name on the account with the full service address with a link to this thread so we can get started.