In an Office 365 hybrid configuration with mailboxes on-premise, is the mail flow basically as follows?
INCOMING EMAIL -> EXTERNAL DNS -> OUTLOOK.COM -> ON PREMISE EXCHANGE 2010 CAS HUB -> ON PREMISE EXCHANGE 2007 MAILBOX -> FINAL DESTINATION
OUTGOING EMAIL -> ON PREMISE EXCHANGE 2007 MAILBOX -> ON PREMISE EXCHANGE 2010 CAS HUB -> OUTLOOK.COM -> FINAL DESTINATION
Does outgoing email definitely flow back through Outlook.com from the 2010 CAS HUB, or does the 2010 CAS HUB send it straight to the final destination?
Thanks