We have existing Exchange 2010 in the production and recently upgrade or implement new Exchange 2013 in the production. Exchange 2013 is currenty subject for testing and not yet gonna be front in the production. we need to test first the send and recieved between 2010 and 2013 before we introduce it on the production as primary.
We have tested the send and recieved via OWA from Exchange 2013 to 2010 but no success
Tested to send internal email from 2010 to 2013 still no success.
Tested Internal send and recieved from 2013 to 2013 it's sucess
Troubleshooting done :
Create new Send connector in 2010 routed to MX record and added in the scoping the exchange server 2013 as source server.
Created new Send connector in 2013 routed to MX record and added one of the CAS server 2010 in the scoping as source server.
Add Host Record in DNS for Exchange 2013
Based on the Exchange delivery report: