421 4.4.2 Message submission rate for this client has exceeded the configured limit

On of my Outlook 2007 user is getting the following error.

Problem:

'Cannot send the message.Verify the e-mail address in your account properties. The server responded: 421 4.4.2 Message submission rate for this client has exceeded the configured limit'





Findings:

As per my observation user is not getting this error freequently, but he is receiving this error when is going to send bulk mails at a time(every evening before leave the office perimeter this user compose lot of mails and send all the mails in one shot time).

I verified the same @ exchange server Receive Connector level using the powershell command and find out that one of our Receive Connector had limitation of 5 message rate limit(if any user is going to send more than 5 mails concurrently then he will receive the above error).

Get-ReceiveConnector | ft Name, MessageRateLimit

Solution:

We change the receive connector MessageRateLimit from 5 to 20, after that the issue was resolved.


Thanks & Regards,
            R2