Forum Discussion
4.4.2 Message submission rate for this client has exceeded the configured limit (Exchange 2019)
Resolution: The issue was related to MessageRateLimit, however, we were looking at the wrong part. The receive connector "Client Frontend " is indeed responsible for the email relay for the port 587. However, this is not the only connector which is being used during the process of email delivery. After a thorough investigation, we found out that the "Client Proxy " receive connector is also used in the process and the MessageRateLimit must be also increased. Finally, after increasing the client proxy receive connector MessageRateLimit, the issue was resolved and email limitation was fixed.
Resolution: The issue was related to MessageRateLimit, however, we were looking at the wrong part. The receive connector "Client Frontend " is indeed responsible for the email relay for the port 587. However, this is not the only connector which is being used during the process of email delivery. After a thorough investigation, we found out that the "Client Proxy " receive connector is also used in the process and the MessageRateLimit must be also increased. Finally, after increasing the client proxy receive connector MessageRateLimit, the issue was resolved and email limitation was fixed.
This helped me a lot but the results measured are not one for one. It looks like some type of calculation between the 2 settings.