'Allow insecure authentication' selection not saving in mac mail

I have just installed OS X Yosemite
Several of my IMAP email accounts in mail would not connect unless I select 'allow insecure authentication'.
Having made the selection, and saved, the setting reverts to unchecked.
How can I ensure that the selection remains saved?

I also have unsecure IMAP accounts (I have four email addresses) and when I upgraded I saw the Allow insecure authentication so checked it and then found it reverted so I checked it again and also unchecked the 'Automatically detect and maintain account settings'.
I then had a problem where the SMTP server keep dropping its connection and the only way to get it back was to delete the SMTP definition and recreate it.
After spending several hours trying to get it working and talking to the email hosting support (FASTHOSTS in the UK) I gave up and restored to Maverick.
Anybody out there using Fasthosts, multiple email accounts and has this working? Or even not using FASTHOSTS and has this working.
Anybody upgraded with multiple email addresses (same domain) and using SSL got this working?
Not sure if I should talk to Apple support but that costs £35 and I needed to move on so restore was faster.
thanks in advance for any help out there

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'Allow insecure authentication' selection not saving in mac mail

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