>>> 1. Hotmail/outlook.com puts a green shield in the web UX in front of 
>>> trusted senders
>who authenticate. Is that what you mean?
>> 
>> Only sort of.  That's ad-hoc since each recipient system has their private 
>> list of
>green-bar-worthy senders.  (I mean, if I wanted to get into it, how would I do 
>so?)
>
>It's also difficult for my bank to do any useful user education about that if 
>it's only
>supported by one freemail provider. It would need to be supported by most 
>major MUAs -
>with compatible implementations and a consistent UI - before they could start 
>that
>process.

Right.  To be useful it has to be consistent and well-publicised.
Green bar certs in browsers are the best analogy I can think of.

R's,
John

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