Well, please call Apple and notify them that - in reference to my call - you are apparently only the 2nd person to ever have this problem. It'll help a lot, so when I call them in a month again, they can tell me that they found one other person using Yahoo and Apple Mail that has this problem. [Sarcasm intended]
The more I think about this, the more I believe that this is Apple's way of solving a present problem with icloud, cross device mail synching and user-generated errors. I think they know what the problems are, they know they are locking people into IMAP so that they don't get 7,500 calls a month from new iphone/Mac users about how things aren't working like they should across platforms, they lost emails, or how one is POP and one is IMAP and they have to lead everyone on a tutorial about why if they use POP on one and IMAP on another, emails will or won't disappear on respective devices...etc. That's not my problem, though. They want to phase out POP for Yahoo and other email clients...they may end up phasing out customers.
Some of those customers may end up writing about their experiences online through articles and their blogs. Just a heads up...
What my problem is now is that I have to call 1/5 of the people I send an email to as part of a verification process that the email was sent. I don't have the time or the inclination to keep screwing around with this. It's consistently intermittent, for lack of a better term. Just enough to keep me at a low boil and fuel regret regarding switching Windows to Apple...but not enough to do a wholesale/kneejerk ditch of all the products. Funny? Isn't that where Windows users were for most of the 2000s? Disappointed.
The problem is this - between my two very pleasant but very lengthy calls - to hear from three support personnel at different levels that we don't have this problem sounds about as close as it gets to a lie. Then, after all this troubleshooting on the phone - resetting, reentering of data, test emails...etc - realize they have eliminated the ability to utilize settings that worked for a decade on Windows, and for two years on their own system...there's something amiss here. Really. It smells too much like B.S.
As for going back to Outlook...
I entered the Mac "ecosystem" (Macbook Air, then Ipad, now Iphone 5) so updating things like an address or phone number on a device wasn't this endless updating/connecting and cut & paste process for my mail program vs. my blackberry vs. my ipad.
- I appreciate the suggestion, though. In the end I may end up going back to Outlook...and Windows...and an HTC or Samsung phone...