[Standards-JIG] privacy2 anti-SPIM proto-JEP

[Ian Paterson]

> I would just put them in the offline storage and apply normal 
> offline storage expiration rules.
> 
> If the sender finally sends a succesfull challenge reply and 
> become a correspondent, or a reciever opens the filter for 
> him (probably after OOB contact), the messages are released free.

Yes. Thank you. Very good ideas. :)

I've updated the relevant section:

http://www.clientside.co.uk/jeps/jep-privacy2/jep-privacy2.html#protocol
-challenge

- Ian