POP is not working

the server responded 421 4.4.2 message submission rate for this client has exceeded the configuration limit
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Arif KhanSystem AdministratorAsked:
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Andy MIT Systems ManagerCommented:
This usually indicates that you are attempting to send more emails at once than the server receive connector is configured to handle.

https://social.technet.microsoft.com/Forums/en-US/e12dd909-88df-47a5-b6c5-f81d8f21268c/the-server-responded-421-442-message-submission-rate-for-this-client-has-exceeded-the-configured?forum=exchangesvrsecuremessaginglegacy

As it's a test email it's unlikely you're sending more than one email at a time - may be worth checking to ensure there's no virus trying to spam out on the machine. Would also be worth checking the configuration on the server for the account in question. If you setup a different account on the same machine does it have the same error?
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Arif KhanSystem AdministratorAuthor Commented:
Tried below, Issue got fixed.
To check message rate of receive connector:
get-receiveconnector | ft name,messageratelimit

To Set message rate limit on a particular connector:
set-receiveconnector -identity "Client Frontend TGLPLEX02" -MessageRateLimit 200

To set message with all connector starting name with Default:
set-receiveconnector -identity Default* -MessageRateLimit 200
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Arif KhanSystem AdministratorAuthor Commented:
It helped me.
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