RE: AD review comments on

> As all machines that I am aware of support both POP3 or 
> SMTP receive mode (though I have yet to see /know of 
> an SMTP installation) perhaps making some of the 
> service extensions valid only for SMTP mode installations?

By implementing DSN and TIMELY from sender to receiver,
SMTP is finished.  Both DSN and TIMELY are specified by
other working groups (DSN has been around for a long
time, TIMELY is new).

> Are there any machines that support POP3 only? 

I don't know for sure, but I believe such devices exist.

-d

> Vivian - The Xerox machine is most probably an OEM of Toshiba.