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Cool, but remember that Gmail automatically saves, to your drafts folder, everything you enter into a new email message.

Even Google got bitten by that one during the Oracle lawsuit.

Is there a workaround for this? Until then, one should stick to native email clients/Thunderbird for confidential comms.

Yes. Write the text of the mail somewhere else, then use the (not yet implemented, I'll do it tonight) option "paste clipboard encrypted".