Hello guys, I have an interesting weird case for you.
We have our Exchange 2013 environment (2 servers).
Our internal apps all are pointing to the load balancer, however, when it balances to the second node (let's name it "Server02") some emails go through, some not. Most not. This occurs even if the application points directly to the server (not going through the load balancer), so it isn't the LB.
The ones that doesn’t work, we get a "421 4.4.2 Message submission rate for this client has exceeded the configured limit", however, the MessageRateLimit for that Receiver for it set to Unlimited, on both servers.
We restarted the servers, but the issue remains.
To replicate the problem, we are using the Send-MailMessage -SmtpServer Server0# -from test@xxx.yyy -to me@xxx.yyy -Port 25 -Verbose -Body "Tested with Server0# at HH:mm" -Credential $cred
At the same time, we try to both servers, so we can check against both servers.
Here’s our findings:
- If we test without the credential parameter (AKA anonymous), it works with servers.
- If we test with an Exchange Admin account, it works with both servers.
- If we test with the application account, it works only with Server01.
Any suggestions?
Alexander S.