>As for (b), it's impossible for each site on the Internet to know
>every other site's resources. That's why the remote sites *have* to be
>responsible for controlling their own resource usage.
How many times have we heard horror stories about hoxes, spam, etc causing
floods of postmaster@ and abuse@ mail to a site causing their mail system
to repeatedly crash and burn under the load?
How many sendmail sites are merely time bombs waiting to go off?
Obviously you can't have perfect solutions, but systems should be
demand tolerant enough to handle overloaded conditions gracefully.
I'm not saying qmail is perfect -- far from it. However we're entering
a new age, and that requires thinking about things that weren't big