We've been using Exchange 2010 for all possible roles for a long time. Now we've got ourselves new Exchange 2016 installation within same site, same domain, in order to migrate mailboxes there and get rid of old Exchange 2010.
One of few problems I've run into is that there was no mail flow between two servers. I can move mailboxes between two as much as I want, but when I send email to mailbox on other server - no success.
I've managed to half-solve the issue by adding receive connector on 2010. Now I was able to send mail from 2016 to 2010. Connector is like that:
listen on port 25 on primary interface accept mail from 2016 ip authentication with TLS and Exchange Server Exchange Server permission group
But I don't know how to configure Exchange 2016 to be able to receive mail from 2010. I've messed around with it's default Frontend connector for a bit (tried to make it look basically the same) but no success. In fact I'm not even sure if receive connector is what I need. That's the reply I've got for messages I send from 2010 to 2016:
Diagnostic information for administrators: Generating server: oldserver.contoso.com firstname.lastname@example.org #550 4.4.7 QUEUE.Expired; message expired ## Original message headers: Received: from oldserver.contoso.com ([172.22.223.2]) by oldserver.contoso.com ([172.22.223.2]) with mapi id 14.03.0123.003; Thu, 28 Jul 2016 17:20:32 +0600 Content-Type: application/ms-tnef; name="winmail.dat" Content-Transfer-Encoding: binary From: Old Server Mailbox <email@example.com> To: New Server Mailbox <firstname.lastname@example.org> Subject: Test08 Thread-Topic: Test08 Thread-Index: AdHowgsxCxzf+vHaQi2Wb9IRsLMA1A== Date: Thu, 28 Jul 2016 17:20:31 +0600 Message-ID: <A8216FA42D4DBF4BA9F4F78BD4B88C396ECDF84F@oldserver.contoso.com> Accept-Language: en-US, kk-KZ Content-Language: ru-RU X-MS-Has-Attach: X-MS-TNEF-Correlator: <A8216FA42D4DBF4BA9F4F78BD4B88C396ECDF84F@oldserver.contoso.com> MIME-Version: 1.0 X-Originating-IP: [172.22.232.48]
So any wisdom about how to make them work together is welcome.