I have Google’d around asked a lot of smart people and still can’t come up with a solid answer. More specifically, the question I have is:
Why, when sending emails to certain domains, do I get the error: 451 Could not load DRD for domain
Because I deal with fairly large mailing lists, I see odd errors a lot. Most of them I can disregard. In any case in which I see an error over 1,000 times, I make it a policy to deal with it. I have seen one close to 9 million.
It appears to be an error from a Symantec appliance, but people write about it coming from Exchange servers as well.
If anyone has any idea what this, please email me, leave a comment, or post a link to somewhere.