When writing a new email (i.e. not answering a previous one) which is automatically marked to be encrypted the drafts are save unencrypted. This happens when the email is automatically marked as encrypted, either by a per-recipient rule or using the new system on 1.7 which encrypts when there are stored pubkeys for the recipients. If the email is manually marked to be encrypted (e.g. by clicking the yellow key symbol on the bottom-right) the drafts are correctly encrypted before being sent to the IMAP server.
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