[Exim] broken MTAs

I see a *lot* of traffic in this newsgroup refering to:

"some broken MTAs"

which MTAs are broken? Can anyone name 2 ? (excluding anything
produced my Micr$so$t).

--
Jim Pazarena  Box 550                 mailto:paz@qcislands.net
              Queen Charlotte  BC     http://www.qcislands.net/paz
              CANADA   V0T 1S0        phone:250 559 7777