Servererror: 451 Temporary local problem - please try later (exim / @hotmail)

Hello,
a customer of mine has issues sending email to @hotmail/@live/@outlook mail addresses.
the problem only occurs with these Microsoft addresses!
when sending an email they get an error email reply (generated from within outlook) from "systemmanager"
saying "Servererror: 451 Temporary local problem - please try later"
just like Graylisting, when the costumer sends the email for the second time all works fine.
My exim server log says:
2014-05-27 15:03:19 H=(MAC01) [37.xxx.xx.130] F=<[email protected]> A=login:[email protected] temporarily rejected RCPT <[email protected]>: host lookup did not complete
2014-05-27 15:03:22 H=(MAC01) [37.xxx.xx.130] incomplete transaction (QUIT) from <[email protected]>
can somebody tell me how to fix this?
and or point me in the right direction where the problem might be (Microsoft, my server, costumer mac)!

Hi,
To narrow down the issue, please do the following checks:
1. What’s you Outlook client, Outlook 2013 or Outlook 2011 for Mac?
2. Does the issue only happen to one specific user? How about other users?
3. What’s the problematic user’s account used to send messages? Exchange account or other webmail account such as Hotmail, Gmail?
4. Please close Outlook and access the webmail to send test messages to @hotmail/@live/@outlook mail addresses and check whether the issue persists.
5. If the issue doesn’t happen in webmail, please also create a new Outlook profile to have a try:
http://support.microsoft.com/kb/829918/en-us
Thanks,
Winnie Liang
TechNet Community Support

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