*** If I am not wrong In Exchange 2010 , any email you send or receive Internally goes through CAS server, before it reaches the destination mailbox. Also when receiving email from external users it should go through CAS before you receive it in you mailbox. Sending out email does not have to go through your internal CAS.
Well, am I correct on my above statement? correct me if I am wrong.
****Now for Exchange 2013. If an internal user sends an email to an internal user , does the email have to go through CAS(Front End Server) then to the mailbox server of another internal user ?
***I believe if external user sends email to an internal user, it should come through CAS(Front End server), before it reaches internal user mailbox.
***the same as for OWA, if internal user wants to check their email using OWA , I believe the process of checking, should go through CAS(front end server) to determine where the user mailbox is, then redirect the user to their mailbox.
Any Exchange expert to clarify the confusion ?