Set MessageRateLimit on Exchange ReceiveConnector
Get-ReceiveConnector | fl Name,MessageRateLimit,MessageRateSource Get-ReceiveConnector "server\connector" | set-receiveconnector -MessageRateLimit 100
windows:servers:exchange:messageratelimit
Get-ReceiveConnector | fl Name,MessageRateLimit,MessageRateSource Get-ReceiveConnector "server\connector" | set-receiveconnector -MessageRateLimit 100