On Sat, 18 May 2013, 14:23:43 CEST, Spencer MacDonald 
<[email protected]> wrote:
> Also you may say something that is "confidential" that you might want to
> remove after the recipient has acknowledged it.

You really want to use some end-to-end encryption for that.

Carbons (XEP-280) has a method for excluding single messages from processing.  
That could be used to signal a wish for having a message excluded from 
archiving, possibly broken out into a XEP of its own.

Or maybe security-labels.

--
Kim

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