> In a corporate context, this makes perfect sense. If I am downloading company 
> confidential 
> material to my laptop, I want to be able to read it on the laptop but I don't 
> want to accidentally 
> send a copy to someone else by doing an unfortunate 'reply all'.

So another thing to note in security considerations is that this is a scheme 
intended to protect well behaved actors who have good habits and an honest 
software ecosystem from causing damage due to specific single honest mistakes. 
It is not intended to protect against adversaries, well behaved actors who have 
sloppy habits, well behaved actors who make more than one mistake on the same 
message (reply all + attachment with no tag/inappropriate tag), or well behaved 
actors who make a single mistake from which multiple correlated incorrect 
actions are derived (misclassify content -> incorrect content tag/incorrect 
mailing list). 

In light of these things, I think any language about "ensuring that policy is 
followed" or the like should just be expunged. If the target is to encourage 
well-meaning partners to do the accepted thing, that's how it should be 
presented.

Bryce





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