Greetings,

I'm in the process of migrating our exchange 2010 environment to 213 Here is our current setup

2 2010 Exchange servers EX2010-01  (MB, CAS, TRANSPORT)  EX2010-02 (MB) we have a DAG between 2 servers

I've installed 2 2013 Exchange servers EX2013-01 (MB,CAS) and EX2013-02 (MB-CAS) and created a DAG between 2 servers

I was able to successfully migrate one of the test mailboxes from 2010 to 2013 and added both 2013 servers to send connectors.  I'm able to connect to Outlook/OWA on the LAN and send/receive emails to external accounts.  I'm also able to receive email from internal accounts.  However I'm not able to send emails from Outlook to local users that are still connected to the old Exchange 2010.  Looks like email goes out and showing in sent folder but never gets delivered to the local recipients

I checked exchange tracking log and I'm able to send email to myself by anyone else internally is showing as "submit storedriver"

Run this cmdlet from exchange 2013 and from exchange 2010.

Get-TransportService | Get-MessageTrackingLog ResultSize Unlimited Start 02/26/2015 Sender user@domain.com -Recipients user@domain.com MessageSubject Mail flow test | Sort TimeStamp | Select ClientHostname, ServerHostname, ConnectorId, Source, EventId

2010

and 2013

Hi Alex

According to your description, my understanding is that you cannot send email from the mailbox on exchange 2013 to the mailbox on exchange 2010, right?

Did you get any NDR message when you send email to internal user?

In addition, please check the permission of receive connector on exchange 2010 server :

Get-ReceiveConnector |fl name, permissiongroups

Best regards,