So, you may ask, what do small flightless birds have to do with the Cox email transition to Yahoo? Well, arguably they could have done a better job. Yahoo has been taking and hosting email domains from cable companies around the country for well over 15 years. Hosting mail is a pain with all the spoofing, SPAM, DKIM nonsense, and whatever new rule the EU cooks up to make everything worse. The move to Yahoo is usually seamless. Mail just moves and is hosted by Yahoo. On your Mac, iPhone, iPad, etc. you just select Yahoo when setting up your mail and it just works. This is not the case with Cox, so let's go over what you need to be aware of.
You Must Use Webmail on Your Mac (For Now) Right now in order to set up your transitioned Cox email to work in Mail on your Mac, you first would need an app specific password from Yahoo. Once this password is generated you cannot see it again and you can only use it once. Then you would need to manually enter in the ingoing and outgoing mail servers. Sounds ugly, right? Well, it is and it is unstable. When and if it breaks you would need to delete that instance of Mail from your Mac, generate a new one time single use only for you password, and then set up email again. Ick. We are guessing that once all the Cox mail is moved and all the mail records point to Yahoo, you can just set it up as a Yahoo mail and you're done. In the meantime, just use webmail.
Remove Old Cox Email from iPhone and iPad The good news is that the Yahoo mail setup on the iPhone and iPad now works for most everyone except those that use POP (you know who you are). It did not last week, but enough people burned up the phone lines at Yahoo that they fixed it. But, you will need to first delete your Cox email from your iPhone and/or iPad or the two accounts will bump heads. Then you can set it up as a Yahoo account.
No More Forwarding If, like us, you forwarded your Cox email to another account, then know that forwarding is not available at Yahoo unless you pay $5 per month and sign up for Yahoo Mail Plus. This may be worth it depending on how you have been using your Cox email. Still, going from free to $5 per month for a forward kinda stinks. But if a Big Mac is now $18 then whatever....
The one good thing is that since your Cox email has moved and is now essentially a Yahoo account, if you cancel your Cox service you should be able to keep your email. This can be good with the advent of 5G internet. It's at least a silver lining. | 
