Thanks Ken for your thoughts. I do think it is interesting that seems clearly to some specific issue between Yahoo and Apple. One would hope that Apple would ride to the rescue, but as you intimate, perhaps they simply think "no, you should use only .icloud emails."
And you are completely right that currently, we are as a nation (world?) engaged in a cultural wrestling match about communication. I teach history at a local college, and have spent the past 25 years with a focus on the development of culture, so the entire last 5-10 years has been very intriguing for me. In the past with disruptive communication tools (telegraph and then telephone), culture had a very long time to establish norms and "rules" for behavior. In our current situation, email was disrupted before it really hit 20 years (I know, I know..."email" has been around longer among the tech crowd); I was writing on my blog and teaching people about possible email communication ettiquette rules in the early 2000s, but before any of those concepts really took hold among the culture, texting, then AIM, then communicating via web-based things like Myspace/Friendster/Facebook, and now Twitter and visual commnication tools like Skype, Facetime, and Google's efforts. Whew. We, as a culture, simply are unclear how to proceed in this Balkanization of communication and in my world, both with my friends, my college, my family and my church...it has led to many challenging issues.
Well, that is off-topic (sorry Mods). In the past week, I have merely had to retype my password for Mail, but it hasn't denied me access due to a port issue. However, I also have not tried to delete anything. I was previously trying to delete the junk mail in the "Bulk Mail" folder that Yahoo put for me in Mail. I was consistently denied, which led to my search for answer here in the first place.
I wonder what other email platforms others, using Yahoo, have tried....and to what level of success?