Exchange 2010 on prem servers, Exchange 2013 hybrid server. email sent from an on prem account do not show up in a migrated user's mailbox, Migrated users can send to on prem mailboxes.
In EAC, on the enterprise side, a message trace produces this:
253 on prem to migrated
From: 365OnPrem User
To: 365SYNC user
Sent: 6/15/2016 2:53 PM
Delivery Report for 365SYNC user
(365sync@school0.mail.onmicrosoft.com)
Submitted
6/15/2016 2:53 PM PRIUS
The message was submitted to prius.school.edu.
Pending
6/15/2016 2:53 PM prius.school.edu
Message was received by prius.school.edu from Prius.school.edu.
6/15/2016 2:53 PM prius.school.edu
The e-mail address for recipient "365sync@school.edu" was updated to the e-mail address "365sync@
school0.mail.onmicrosoft.com". The message is in the process of being delivered.
6/15/2016 2:53 PM prius.school.edu
The message has been queued on server 'prius.school.edu' since 6/15/2016 2:53:26 PM (UTC-05:00) Eastern Time (US & Canada).
The last attempt to send the message was at 6/15/2016 2:50:32 PM (UTC-05:00) Eastern Time (US & Canada) and generated the error '[{LRT=};{LED=};{FQDN=};{IP=}]'.
Any clues are appreciated.