This failure means that the requested mailbox is temporarily unavailable; this is not an indicator that the mailbox actually exists or not but, often, a message sent by external mail exchangers with greylisting enabled.
So cannot unallot the Whois Guard (or) Whois Guard does not exists.
Link Id=5171"I have checked out that site, but it just talks about active directory and we don't even use active directory here.....
I can't seem to figure out what to do at this point....usually when a machine falls off the domain, I simply remove it from the domain on the machine, and uninstall and reinstall the network drivers and re-add it to the domain and it works, but not this time.....
This condition may be caused by a DNS lookup problem.
For information about troubleshooting common DNS lookup problems, please see the following Microsoft Web site:
In this blog we will look at how to configure a Stub Zone in DNS. Two organizations, USSHQ and Dulce Base need to be able to share resources.
NET comes with a total of 40 different result statuses, giving precise indication about the nature of the failures the component generates while validating email addresses; along with these, the software reports back every single detail about each validation process, including information about the syntactical analysis, embedded comments, internationalized parts, DNS MX (mail exchanger) records as well as the complete transcript of the eventual SMTP session. NET either reports back a success - meaning it completed the validation process up to the required level - or a failure; among the kinds of failure the component supports, some should be considered as temporary failures, meaning they could disappear on a new, subsequent validation, and include network and timeout issues as well as greylisting detections and mailboxes over quota and conditions where a mail exchanger appears to be too busy.
And to be a a bit more specific with the information I provided.
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When a Stub Zone is configured the local DNS server will forward the request to a DNS authoritative for the domain namespace of the query.
Now you are thinking to yourself, sounds a lot like what a Conditional Forward does.