new email-arch version

Folks,

In response to the recent round of comments, I've submitted a new version of 
email-arch as an I-D.
Various formats of -08 are available at <http://bbiw.net/recent.html#emailarch>.

Please note the changes section, at the end of the Introduction.

d/
--

  Dave Crocker
  Brandenburg InternetWorking
  bbiw.net