Exchange 2010 - max message per user per minute

I have an issue with one user on our system.
The user is connected to Dynamic CRM and at the end of the month aprox 300 emails are sent at the same time.
The problem is that when certain limit is reached, the system no longer process the queue.
I first thought that it is related to maxrecipientlimit, but there is one recipient per message, so this is not the case.

Can you guys help me with this?
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Joshua GrantomSenior Systems AdministratorCommented:
The max recipient limit is still the cause it goes by time, not by message. Look here
webox_suuportAuthor Commented:
Thanks for the answer.
The limit is set for 500 for everything according to the link (already visited it before posting here), but when the queue is reached to 200 messages approx, the queue is stuck and process the other emails much slower
Joshua GrantomSenior Systems AdministratorCommented:
So the receive connector, hub transport, and entire organization are all set to 500?
webox_suuportAuthor Commented:
Yes, everything is set to 500.
The exact error that I'm seeing in the CRM is:
Message submission rate for this client has exceeded the configured limit
Joshua GrantomSenior Systems AdministratorCommented:
try this in EMS

Set-recieveconnector "Server Name" -Messageratelimit 500.

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