Johannes Erdfelt writes:
Although there are other things that will prevent a dead circuit to
hotmail.com from plugging up the entire queue, it's still better to minimize
the degree of pluggage as much as possible.
First off, what's to say the other MX's at the same priority will be
down? You're just guessing here and I don't see how you can guess
accurately either way.
It wasn't that long ago when all of microsoft.com was DOSsed off the net
because they put all of their DNS servers on the same subnet, and the sole
router upstream of their got DOSsed into hell.
A little investigation shows that all of their MXes are in just two subnets.
If all of their servers refuse to accept the mail, then it's their
If you have a huge mail queue as a result of that, affecting all of your
mail traffic, it now becomes your problem too.
There's a perfectly valid reason for it and no detriments. I don't see
how you can just ignore it for anything less than it's horribly broken
You got it. It's horribly broken.