I think Stan already pointed you to where your problem most likely lies, but just wanted to point out that this:

On 2011-12-30 1:53 PM, Calvin Cochran <qmailcal...@gmail.com> wrote:
Most of our clients, including this one, use SSL or TLS and connect
on 993.

I believe is incorrect. Port 993 is for IMAP over SSL, if the client is using TLS (or more correctly, STARTTLS), then they should be using the normal IMAP port 143.

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Best regards,

Charles

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