Hotmail was having issues with their server farm. Many servers died due to high 
temperatures. Maybe it's related?

http://www.pcworld.com/article/2030836/microsoft-blames-outlook-hotmail-outage-on-overheated-servers-apologizes.html

Also some things I thought about

* can your look up and resolve some of their MXers?
** dig mx hotmail.com
* did your host make it on a blocklist?
** http://mxtoolbox.com/blacklists.aspx

On Tue, 19 Mar 2013 10:04:41 -0600
Eric Broch <[email protected]> wrote:

> On 3/19/2013 9:49 AM, cj yother wrote:
> > On 03/19/2013 05:08 AM, Eric Broch wrote:
> >> Hello list,
> >>
> >> I have a user trying to send mail to a Hotmail account. The following
> >> error continues to reoccur:
> >>
> >> Server error: '451 DNS temporary failure (#4.5.1 - chkuser)'
> >>
> >> I looked over qmail archives and found scant info on the subject. Is
> >> this a problem with hotmail?
> >>
> >> Eric
> >>
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> > That's most likely on your end.  Does your server resolve hotmail.com
> > correctly?  I also have heard that hotmail is being phased out and
> > maybe they are in the process of making the changes.
> >
> CJ, Yes it resolves correctly.
> 
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-- 
Sebastian Grewe <[email protected]>

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