We really do need to remember just how limited bandwidth (in particular)
and "Internet performance" are in much of the Internet. Added to that is
that much of the user community pays a usage fee for connection time.
sure, but compressing modems *are* widely deployed. if the "connection"
uses a compressing modem, any additional savings in "connection time"
resulting from smtp or mime compression is truly marginal.
you'll get more connection time savings from pipelining smtp than you
will from compressing the data.