I really appreciate your help. I’ve checked the Cox link and didn’t get any help from Cox. I was able to get to the setup page, perhaps through spoofing the app. While I was able to input the Yahoo IMAP and SMTP host name settings, when trying to save my work I get a message that the settings can’t be verified. I’ve checked userid, passwords, etc numerous times.
At this point I am pretty much convinced that the userid, @cox.net, is causing Mail to try to verify my userid with Cox instead of Yahoo. Of course my password is associated with Yahoo.
I confirmed this earlier my checking the log for connection doctor. I could get a connection to the Yahoo SMTP server, but the log showed a failure to connect to the Cox IMAP server.
Again, I appreciate your help and I will resume my task tomorrow. Thanks.