Email routing in a cross-premises environment Otherwise, if your long-term goal is to maintain a cross-premises messaging environment indefinitely, and you are not interested in Exchange Online Protection, you can choose to leave the MX record as it is currently configured. In this configuration, you can take advantage of Exchange Online Protection (EOP), for all inbound email to your organization. ![]() Generally speaking, if you plan to move all your messaging to the cloud (employing a cross-premises deployment as part of a longer-term mail migration strategy), configuring your mail exchanger (MX) record to direct inbound email to the cloud first is a logical choice. ![]() The one you choose depends on the goals of the cross-premises deployment. From an implementation perspective, the choice comes down to where inbound mail goes first: to the on-premises messaging system or to the cloud. To enable any cross-premises messaging scenario, you need to determine how you will route email between the on-premises organization and the cloud. The users will need mail-enabled as part of the coexistence process. To meet these requirements, install the Exchange 2016 Mailbox server role on a server in the on-premises organization.Įvery recipient object from the third-party system needs to have corresponding user object in local Active Directory. The Exchange Management Shell and the Exchange Server Active Directory schema are required for managing email-related users. ![]() The on-premises organization is running Active Directory with the Microsoft Exchange 2016 or later schema updates. The cloud address list, proper mail routing, and message format fidelity all meet business-class requirementsĪ subscription to Microsoft 365 or Office 365 (must be an enterprise subscription). Or, as part of a migration strategy, the mail-enabled users in the cloud might be licensed with Exchange Online mailboxes.Ĭross-premises coexistence might last indefinitely. Mail routing from the cloud to the on-premises organization uses a shared domain namespace. Users with on-premises mailboxes should be represented in the Exchange Online global address list (GAL) as mail-enabled users. This email coexistence might be a short-term or long-term solution.Īs you plan for this third-party email coexistence, consider the Azure Active Directory hybrid identity options and the authentication choices for synchronization and end user authentication options. ![]() A unified address book in the cloud shows all users in both the on-premises and cloud organizations. A third-party messaging system remains in the on-premises organization and shares an email namespace (domain) with the Exchange Online messaging system in the cloud. In this scenario, the goal is to support cross-premises email coexistence. This topic is for organizations that use Active Directory as their on-premises identity platform and a third-party messaging system (for example, IBM Lotus Notes or Novell GroupWise) for email. Most Microsoft email migration information assumes that you're running Exchange Server in your on-premises organization.
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