My new work email address fails initial attempts with "451 Requested action aborted: local error in processing."
A well-timed retry got through OK, suggesting this is just a graylisting issue - could the mailhost configuration robot not provide at least the option to queue the configuration email for automatic retries?
(As a workaround, I sent the address a test email of my own through Spamcop webmail just after getting this error; as soon as that arrived, I reloaded the mailhost configuration page with the error, forcing a retry at the appropriate time. It worked, but hardly ideal!)
On a related note, the ability to mark certain IP addresses or netblocks as "friendly/trusted", rather than jump through robot configuration hoops, would be very useful and should be more effective at avoiding "friendly fire" reports long term too.