Exchange 2019 SMTP random delays of 1 minute when sending email

did you find a solution? I may be having the same issue. We migrated from an on-prem exchange 2019 server to an on-prem exchange SE server (both hybrid, but all operations are on-prem). Never had the issue on the old server, but new one a couple times an hour I will get a notification from our network monitoring app that it is having issues using the SMTP receive connector. Protocol logs show the email goes through, but during the data send there is about a 1 min delay before the server responds that the message was accepted. By that time the client has already crossed a client side timeout and assumes the email failed even though the receive connector was just causing a delay and the original email sends.

I've been comparing the old 2019 server configs to the new SE server configs. I'm not seeing a difference that would be causing this random delay.