Mac Mail is continuously adjusting the "allow insecure authorization" option on it's own

I've already lost 3 clients due to a lack of timely email response, and I had no idea why Mac Mail was having issues connecting to my email server. I've spoken at length with my web hosting support, and it turns out the options in Mac Mail for "Automatically detect and maintain account settings" and "Allow insecure authentication" are new with Yosemite, in both the incoming and outgoing settings (see below).
Well it turns out the only way for me to be able to even use Mac Mail and have it connect to my email server, I have to have "Automatically..." unchecked, and "Allow insecure..." checked in each and every one of the accounts. I completely hate the idea of having to have anything "insecure" associated with my email, but it's the ONLY way I can get it to function properly, and I don't have the time to integrate everything to another email program at the moment. Not only is this a huge security risk in general, but the program will continuously uncheck the "Allow insecure authentication" option entirely ON IT'S OWN about every 20-30 minutes or so, completely jam up all communication I'm working on, require me to go back through and repeat the same tedious process for each and every one of the accounts, and then ALSO have to totally shut the program down and reopen it for the settings to take effect. In fact, the second of the two images seen above JUST unchecked the "Allow insecure authentication" box between the time it took me to start this post and take the screen shot!!
Something HAS TO BE FIXED with this or it could be a huge issue in a lot of ways. I'm planning on dropping the whole program altogether just as soon as I have the time to properly migrate all of my email setup to another program (which I'm looking forward to less than I would a root canal), but for now I'm just hoping and praying I make it that far without either a major security breach or losing any more clientele. As is, I've lost three clients in just the last week from not being able to correspond on tight deadlines.
Downgrade, in all meanings of the term...

Since you are doing a workaround, try deselecting use SSL.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
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Mac Mail is continuously adjusting the "allow insecure authorization" option on it's own

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