We have a hybrid deployment and we migrated from Exchange 2013 to 2019. But we see that emails sent from on prem mailbox is going to EX2019 server, and then to EX 2013 sever and then back to EX2019 server. And then it goes to O365.
We want emails to go to EX2019 server and then to O365 directly. We cant figure out why it is going to EX 2013 server in between.
The send connectors are scoped to EX 2019 servers only. There are no active transport rules.
Please help to figure out why email is going back to 2013 server.
Here's a similar thread for your reference: https://docs.microsoft.com/en-us/answers/questions/601846/mailflow-issue-after-installation-of-excha...