If , check for the internet and ensure to open Cox email on a compatible browser. Along with it, if the browser is compatible and Cox email is not working properly, you should try to clear the browser like cookies, cache, etc. Start by turning off the 3rd party extensions and add-ons installed in the browser. You can also disable the add-ons to identify which add-ons are problematic. Switch to the other browser and load the Cox email once again. The next step is to disable the Windows antivirus and firewall if the issue continues. In case if your Cox email not working on Thunderbird or Outlook, then you should recheck the IMAP or POP configuration settings.