Cox email transition - has anyone completed the transition to Yahoo

I have a separate email account outside of Cox, but I still use the Cox email address for companies that are more prone to selling my info, etc.

One good thing is that if you used your "@cox.net" address as a username for various accounts, you can still change the correspondence email address (usually)  on those accounts to something else (if you want to). Trying to change the username itself can be a major issue.

I am a bit concerned about inbox security with Yahoo.