If Chris and reporter K Harwood could duplicate the problem while recording an IMAP:5 log it would certainly help. I never actually seen this problem so I have no idea at this time what is causing it for you. You can find the details on how to create the log by looking here: https://wiki.mozilla.org/MailNews:Logging The log should record which IMAP command is causing the problem. When you have the log, please attach it using the "Attach file" link above or provide a link to a file sharing service if you prefer. You might want to redact personal info that might appear in the log before attaching it. Thanks!
Bug 1571655 Comment 4 Edit History
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If Chris and reporter K Harwood could duplicate the problem while recording an IMAP:5 log it would certainly help. I have never actually seen this problem so I have no idea at this time what is causing it for you. You can find the details on how to create the log by looking here: https://wiki.mozilla.org/MailNews:Logging The log should record which IMAP command is causing the problem. When you have the log, please attach it using the "Attach file" link above or provide a link to a file sharing service if you prefer. You might want to redact personal info that might appear in the log before attaching it. Thanks!