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IMAP: refuse to work when STARTTLS is required but server sends PREAUTH
Oops, we cannot send STARTTLS when the connection is already authenticated. This is serious enough to warrant an error; an attacker might be going after a plaintext of a message we're going to APPEND, etc. Thanks to Arnt Gulbrandsen on the imap-protocol ML for asking what happens when we're configured to request STARTTLS and a PREAUTH is received, and to Michael M Slusarz for starting that discussion. Hope the error message is readable enough. CVE: CVE-2014-2567
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