notmuch-mutt: support for duplicate message removal

[Daniel Kahn Gillmor]

On 08/01/2012 12:26 PM, Andrei POPESCU wrote:
> I'm at least one user that cares enough about the distinction to have 
> all list mails received via a different address, just to avoid Gmail's 
> "feature" of silently dropping my own messages received via a list. 
> IMVHO it should at least be configurable...

The proposed feature could also exacerbate the previously-discussed
attack vector [0] whereby a malicious Message-ID collision can be used
to hide messages from the victim's mailstore.

	--dkg

[0] id:87k42vrqve.fsf at pip.fifthhorseman.net

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