We have Exchange 2013 CU3 organization (2 CAS servers and 2 mailbox servers) and about 40 accepted domains. We've configured incoming mails to go through EOP and be delivered to our on-premises Exchange. Now we need to configure outbound mail flow to go through EOP. We've seen that in Outbound connector on Exchange 2013, for Smart host we should enter our MX record, for example abc-com.mail.protection.outlook.com.
Since we have ~40 accepted domains and ~40 different MX record, what should we enter for Smart host in Outbound connector on our Exchange 2013? I didn't found anywhere that anyone mentions similar scenario.
Thanks