I've got an Exchange 2010 and 2013 coexistence scenario (migration project). I'm not able to send an email from a mailbox residing on Exchange 2013 to a mailbox residing to Exchange 2010. I've tested the following with powershell send-mailmessage:
Send-MailMessage -Body "" -To User2013 -SmtpServer 2010server -From "" -Subject "" > succesfull Send-MailMessage -Body "" -To User2013 -SmtpServer 2013server -From "" -Subject "" > succesfull Send-MailMessage -Body "" -To User2010 -SmtpServer 2010server -From "" -Subject "" > succesfull Send-MailMessage -Body "" -To User2010 -SmtpServer 2013server -From "" -Subject "" > NOT succesfullI also can send an email from an user on the Exchange 2013 server to our mailgateway (smarthost). I've added no additional receive connectors on the Exchange 2013 server. The email that's not delivered remains in the Exchange 2013 queue. Exchange 2010 is still the main email server so all messages are delevired to this server (have not moved mailboxes yet).
We've got one 2010 server and one 2013 server with all roles installed.
What am I missing here, or will this work when I make Exchange 2013 the dedicated server?
Thnx Remco