If, however, you admit that it causes problems for sendmail installations, and
you admit that a lot of sites use sendmail, then you'll probably agree that
defining "good netizen" would include "limiting outgoing connections to a
particular MX" ... to some reasonable number (heck, you can detect
For your #1: this would be similar to the Linux kernel approach to DMA on hard
drives ... enable by default, except on those drives we have in database of broken
drives.
As for #2 and #3: this adds overhead, of course, but could inherently reduce
overhead down the road, as long as the algorithm
