Message submission rate for this client has exceeded

September 27th, 2022 | Tags:

In my case Application was using Port 25 and using the app custom connector on load balanced Exchange 2016 servers and message rate limit was set to unlimited.

Get-ReceiveConnector SERVERNAME\* | FT Name,bindings,MessageRateLimit

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Solution –

Late realized its the Client proxy connector causing the bottleneck. Increased from 5 which is the default value . Changed to 30.

NOTE  : Below Commands sets the rate limit for all Exchange servers in the environment. Use Servername\ for specific server.

Get-ReceiveConnector "*\Client Proxy*" | FT Name,*RateLimit*
Get-ReceiveConnector "*\Client Proxy*" | Set-ReceiveConnector -MessageRateLimit 30

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if you have issue on Port 587 IMAP mail submission- you should increase Rate Limit on below connector

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