I am having the same issue with a system that has been running fine for over a year. All the error messages that are shown here are coming up in my logs and on my iPad and Iphone.
Is this working for anyone? If apple feels this is working please point us to a document that outlines the requirements for the authentication to work. (versions, process and correct settings) I have wasted the best part of 3 weeks trying to resolve this for my users and have no progress to speak of at this point. The server with Dovecot, Postfix and OpenSSL has been running for years.
CJACK7070
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