[and I'll only speak to a few (spend 30 seconds on this page, let people
 read what they want)]
 
 run an Agent to handle all interactions for you

 abstract out CAPTCHA service, to allow tech development and competitive
 market

 identity is defined by a published ID Record rather than an address
 email addresses are pointers to the ID Record
  [once you have the record, you don't need the address any more]

 we use SMTP as a transport layer, one of many, and run a message protocol on
 top of it

[trans] now I'll go into some of the design.