Q: El Capitan iCloud POP Not IMAP, SSL Warning

Yes. This email setup pattern is seeming to be optimal. However, it is not resolving the background POP [corruption]. Setting up the Apple ID account is a good intention. Again, the system iCloud foundation is POP'd. The POP bug has two characteristics that are not intended. First, the Stanford IMAP/POP selection toggle is absent, unless the account is a greyed out pop.servername.domain, working through that default POP assignment. Second, Support's Option-Click or the user's intentional email fudge, establishes a scrambled Folder hierarch. For 3rd party mail apps, there is also the issue that SSL is not available except using insecure ports 143 and 25, which defeats the purpose of SSL.

It is good, I guess, that Microsoft yesterday pushed the insecure IMAP ports 143 and 25 through IMAP, bypassing the always pop server. That seemed to enable giving SSL on the insecure ports (which like iCloud POP "doesn't make sense"). So now, we need 3rd party mail access to secure SSL ports 993 and 465/587, which are only available in Apple Mail, at the end of the day. Most important of all, we still need IMAP iCloud. Experimentally (I guess), Apple support has tried both normal setting up iCloud ID, and optional not setting up Apple ID. In our last interaction, Apple Support did not set up the Apple ID. But we still have iCloud POP!

When Apple ID is setup on my iCloud POP system, then removing the iCloud account during Support session is very difficult. Which is also interesting Support. Another one of those, "That's not supposed to happen!" I wish I could offer some helpful information here. Other than to say that Apple is making progress. In spite IMAP Folder scrambling, Mail App can at least build correct-looking IMAP accounts under secure IMAP mail ports. But I think the initial focus is, why is iCloud POP - and by extension, how do we correct that on this hardware to iCloud IMAP.

A Mac Pro Early 2013 is not necessarily a Mac Pro Early 2013.

Yes, we all go with Apple Support's interjection that "there is no such thing as iCloud POP". But every way we setup the Cloud account in System Internet Accounts (or in Mail Preferences), it sets up as iCloud POP. During the setup process, what I notice is that in certain setups the IMAP POP section toggle is absent, only appears for fudged email trick. When Support arranges [Option-Click] the setup, then sometimes the IMAP/POP toggle appears,  but does not seem to get us anywhere. Leading to the reasonable conclusion that for whatever reason, my hardware's iCloud POP OS X installations are for now necessarily going to fail.

This is not the $5,000 system I paid for.

Please do not reply to this post, unless you read this message carefully enough to understand the last sentence below. Read back over the replies to the original post here, approved by an Ap;care "advisor".

This entire experience with Applecare has taught me that every "advisor" at Applecare has absolutely no control over TITLE that Applecare Services network apples to every CASE. For example, this case, where Mac Pro is constantly changing assigned physical mail ports as been called:

1. New ID not working
2. Needs firewall
3. Mail is sending greetings

And so on. Over 2 dozen cases so far, each with imaginary titles and without any apparent focus n reality, outside of digital fantasies. Naturally, physical Mail Port addressing, like all things digital, being part of something much more complex, has progressed. Now one of two video cards in my new Mac Pro has ceased to function. Yes, several visits to retail store appointments booked by "advisors". Last visit, technician advised, "Sorry, but we don't have much time here. What we know is we can't find any issue with greetings, and since you can't tell us what is wrong with greetings, we have to leave this issue as wait-and-see."

Each 'advisor' has no idea what previous advisors have done. My personal notes could help, assuming advisors are willing to ignore whatever Apple Support Services is pumping at them. Perhaps Applecare support can somehow respond to hardcore reality , in a way that will give me a working Mac Pro. Sadly, every call I make, over the old fashioned telephone, gets routed to a "SENIOR ADVISOR". Then on each call, the senior advisor puts me on hold for ten minutes, "to review the previous advisors notes", and then, "to discuss these notes with the engineers". Maybe Apple spell checker is rewriting everything in the Support environment? Maybe the "advisors" (and for all intents and purposes, invisible "engineers") are like Vikki and Fred, just computer voices, part of some forced public speech technology tune-up? You thunk? Anyway, after the last encounter with a living breathing "technician" at the Apple retail store, we now what follows. And please read that last sentence very carefully. I need community feedback on that sentence.

Now, after one of last telephone calls to Applecare, and after the last visit to Applecare at the Apple Store, Apple support insists I have to manage Greetings differently. Which is why I am giving this Forum a go. For those of you who are interested, my problem, on my brand new Mac Pro, is that the machine is re-assigning assigned ports, which means that send receive only happens when I many times per day go into Preferences and reset port assignments in the Accounts panel. Also, now my new Mac Pro cannot use one of two video cards because of a hardware problem. After four (4) months, Applecare has not come up with anything better than a somewhat global (telephone-store) assertion that greetings are to blame.

I doubt that any Mac pro problem is related to Greetings. I never use Greetings, whatever they are. One of my D300 video cards is not working. Mac Pro keeps re-assigning mail ports. HELP!

...don't ask e to fix selling and grammar in previous post. That was all fine, until I hit Reply.