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Received error code 421-RP-001 in live.com, msn.com, hotmail.com and outlook.com

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Archived post from September 30, 2013. Product: Hotmail – no longer developed by its maker. Details may be out of date.

Question asked on Sep 30, 2013
Hi,

Our company exchange server had been received the error RP-421.
For example, as the below picture.


We're the travel company over 200 employee in Hong Kong and China . 
If the limit under 250-300 isn't enough sent out from our domain to live.com, hotmail.com, outlook.com and msn.com. 
May I know any detail to increase the limit with Microsoft.

Thanks a lot 
 

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